diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..f8b28e4
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,5 @@
+# Elysium Project Notes
+
+## About Page
+
+The About page (`apps/web/src/components/game/AboutPanel.tsx`) contains a **How to Play** guide that should be kept up to date as new features are added to the game. When implementing new game systems, zones, mechanics, or significant UI features, update the `HOW_TO_PLAY` array in `AboutPanel.tsx` to include a description of the new feature.
diff --git a/IDEAS.md b/IDEAS.md
index 34a3e8d..daadede 100644
--- a/IDEAS.md
+++ b/IDEAS.md
@@ -20,7 +20,7 @@ A running list of planned features and content additions. Strike through items a
 
 ## 📦 Content Additions
 
-- [ ] **Equipment set bonuses** — Group existing equipment into named sets (e.g. "Shadow Infiltrator"). Wearing 2/3/4 pieces of a set grants escalating bonuses. Adds strategic depth without requiring lots of new items.
+- [x] **Equipment set bonuses** — Group existing equipment into named sets (e.g. "Shadow Infiltrator"). Wearing 2/3/4 pieces of a set grants escalating bonuses. Adds strategic depth without requiring lots of new items.
 
 - [ ] **The Codex / Lore Book** — Defeating bosses and completing quests unlocks lore entries about the world. Pure flavour, but gives the world depth and a collection mechanic. Show a ✨ notification when new lore unlocks.
 
@@ -43,7 +43,7 @@ A running list of planned features and content additions. Strike through items a
 3. ~~Daily challenges~~ ✅
 4. ~~Boss first-kill bounties~~ ✅
 5. ~~Milestone prestige bonuses~~ ✅
-6. Equipment set bonuses (medium effort)
+6. ~~Equipment set bonuses~~ ✅
 7. Auto-prestige toggle (prestige shop upgrade)
 8. The Codex / Lore Book (flavour, lower priority)
 9. Second prestige layer / Transcendence (big feature, save for later)
diff --git a/apps/api/src/data/bosses.ts b/apps/api/src/data/bosses.ts
index 2f19cec..8de18f4 100644
--- a/apps/api/src/data/bosses.ts
+++ b/apps/api/src/data/bosses.ts
@@ -18,6 +18,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["iron_sword", "chainmail", "mages_focus"],
     prestigeRequirement: 0,
     zoneId: "verdant_vale",
+    bountyRunestones: 1,
   },
   {
     id: "lich_queen",
@@ -35,6 +36,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["enchanted_blade", "plate_armour", "arcane_orb"],
     prestigeRequirement: 0,
     zoneId: "verdant_vale",
+    bountyRunestones: 2,
   },
   {
     id: "forest_giant",
@@ -52,6 +54,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["hide_armour"],
     prestigeRequirement: 0,
     zoneId: "verdant_vale",
+    bountyRunestones: 3,
   },
   // ── Shattered Ruins ───────────────────────────────────────────────────────
   {
@@ -70,6 +73,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 0,
     zoneId: "shattered_ruins",
+    bountyRunestones: 3,
   },
   {
     id: "bone_colossus",
@@ -87,6 +91,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["frost_rune"],
     prestigeRequirement: 0,
     zoneId: "shattered_ruins",
+    bountyRunestones: 5,
   },
   {
     id: "elder_dragon",
@@ -104,6 +109,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["vorpal_sword", "dragon_scale"],
     prestigeRequirement: 0,
     zoneId: "shattered_ruins",
+    bountyRunestones: 7,
   },
   // ── Shadow Marshes ────────────────────────────────────────────────────────
   {
@@ -122,6 +128,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 0,
     zoneId: "shadow_marshes",
+    bountyRunestones: 5,
   },
   {
     id: "plague_lord",
@@ -139,6 +146,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["runestone_amulet"],
     prestigeRequirement: 0,
     zoneId: "shadow_marshes",
+    bountyRunestones: 8,
   },
   {
     id: "mud_kraken",
@@ -156,6 +164,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["crystal_shard"],
     prestigeRequirement: 0,
     zoneId: "shadow_marshes",
+    bountyRunestones: 10,
   },
   // ── Frozen Peaks ──────────────────────────────────────────────────────────
   {
@@ -174,6 +183,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 0,
     zoneId: "frozen_peaks",
+    bountyRunestones: 8,
   },
   {
     id: "ice_queen",
@@ -191,6 +201,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["frost_crystal"],
     prestigeRequirement: 0,
     zoneId: "frozen_peaks",
+    bountyRunestones: 12,
   },
   {
     id: "void_titan",
@@ -208,6 +219,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["philosophers_stone"],
     prestigeRequirement: 0,
     zoneId: "frozen_peaks",
+    bountyRunestones: 15,
   },
   // ── Volcanic Depths ───────────────────────────────────────────────────────
   {
@@ -226,6 +238,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["flame_lance"],
     prestigeRequirement: 0,
     zoneId: "volcanic_depths",
+    bountyRunestones: 12,
   },
   {
     id: "magma_titan",
@@ -243,6 +256,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["volcanic_plate"],
     prestigeRequirement: 0,
     zoneId: "volcanic_depths",
+    bountyRunestones: 18,
   },
   {
     id: "phoenix_lord",
@@ -260,6 +274,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["eternal_flame"],
     prestigeRequirement: 0,
     zoneId: "volcanic_depths",
+    bountyRunestones: 25,
   },
   // ── Astral Void (original) ────────────────────────────────────────────────
   {
@@ -278,6 +293,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["astral_robe"],
     prestigeRequirement: 0,
     zoneId: "astral_void",
+    bountyRunestones: 20,
   },
   {
     id: "cosmic_horror",
@@ -295,6 +311,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["celestial_blade"],
     prestigeRequirement: 0,
     zoneId: "astral_void",
+    bountyRunestones: 30,
   },
   {
     id: "the_devourer",
@@ -312,6 +329,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["infinity_gem"],
     prestigeRequirement: 0,
     zoneId: "astral_void",
+    bountyRunestones: 40,
   },
   // ── Celestial Reaches ─────────────────────────────────────────────────────
   {
@@ -330,6 +348,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["seraph_wing"],
     prestigeRequirement: 6,
     zoneId: "celestial_reaches",
+    bountyRunestones: 30,
   },
   {
     id: "fallen_archangel",
@@ -347,6 +366,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["angels_halo"],
     prestigeRequirement: 7,
     zoneId: "celestial_reaches",
+    bountyRunestones: 40,
   },
   {
     id: "divine_judge",
@@ -364,6 +384,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 8,
     zoneId: "celestial_reaches",
+    bountyRunestones: 50,
   },
   {
     id: "celestial_titan",
@@ -381,6 +402,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["celestial_armour"],
     prestigeRequirement: 9,
     zoneId: "celestial_reaches",
+    bountyRunestones: 60,
   },
   {
     id: "the_first_light",
@@ -398,6 +420,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["divine_edge", "heaven_mantle"],
     prestigeRequirement: 10,
     zoneId: "celestial_reaches",
+    bountyRunestones: 75,
   },
   // ── Abyssal Trench ────────────────────────────────────────────────────────
   {
@@ -416,6 +439,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["depth_blade"],
     prestigeRequirement: 9,
     zoneId: "abyssal_trench",
+    bountyRunestones: 40,
   },
   {
     id: "kraken_elder",
@@ -433,6 +457,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["leviathan_eye"],
     prestigeRequirement: 10,
     zoneId: "abyssal_trench",
+    bountyRunestones: 55,
   },
   {
     id: "abyssal_colossus",
@@ -450,6 +475,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["pressure_plate"],
     prestigeRequirement: 11,
     zoneId: "abyssal_trench",
+    bountyRunestones: 70,
   },
   {
     id: "the_deep_one",
@@ -467,6 +493,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 12,
     zoneId: "abyssal_trench",
+    bountyRunestones: 85,
   },
   {
     id: "elder_abomination",
@@ -484,6 +511,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["abyssal_edge", "abyss_shroud"],
     prestigeRequirement: 13,
     zoneId: "abyssal_trench",
+    bountyRunestones: 100,
   },
   // ── Infernal Court ────────────────────────────────────────────────────────
   {
@@ -502,6 +530,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["demon_hide"],
     prestigeRequirement: 12,
     zoneId: "infernal_court",
+    bountyRunestones: 55,
   },
   {
     id: "hellfire_titan",
@@ -519,6 +548,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["hellfire_edge"],
     prestigeRequirement: 13,
     zoneId: "infernal_court",
+    bountyRunestones: 70,
   },
   {
     id: "lord_of_sin",
@@ -536,6 +566,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["soul_gem"],
     prestigeRequirement: 14,
     zoneId: "infernal_court",
+    bountyRunestones: 90,
   },
   {
     id: "infernal_sovereign",
@@ -553,6 +584,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 15,
     zoneId: "infernal_court",
+    bountyRunestones: 110,
   },
   {
     id: "the_fallen",
@@ -570,6 +602,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["infernal_edge", "sinslayer_aegis"],
     prestigeRequirement: 16,
     zoneId: "infernal_court",
+    bountyRunestones: 135,
   },
   // ── Crystalline Spire ─────────────────────────────────────────────────────
   {
@@ -588,6 +621,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["prism_blade"],
     prestigeRequirement: 15,
     zoneId: "crystalline_spire",
+    bountyRunestones: 70,
   },
   {
     id: "crystal_drake",
@@ -605,6 +639,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 16,
     zoneId: "crystalline_spire",
+    bountyRunestones: 90,
   },
   {
     id: "the_faceted",
@@ -622,6 +657,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["faceted_armour"],
     prestigeRequirement: 17,
     zoneId: "crystalline_spire",
+    bountyRunestones: 115,
   },
   {
     id: "diamond_colossus",
@@ -639,6 +675,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["prism_eye"],
     prestigeRequirement: 18,
     zoneId: "crystalline_spire",
+    bountyRunestones: 140,
   },
   {
     id: "crystal_sovereign",
@@ -656,6 +693,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["crystal_sovereign_blade", "diamond_plate"],
     prestigeRequirement: 19,
     zoneId: "crystalline_spire",
+    bountyRunestones: 175,
   },
   // ── Void Sanctum ──────────────────────────────────────────────────────────
   {
@@ -674,6 +712,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["void_annihilator"],
     prestigeRequirement: 18,
     zoneId: "void_sanctum",
+    bountyRunestones: 90,
   },
   {
     id: "eternal_shade",
@@ -691,6 +730,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["eternal_shroud"],
     prestigeRequirement: 19,
     zoneId: "void_sanctum",
+    bountyRunestones: 115,
   },
   {
     id: "the_unmaker",
@@ -708,6 +748,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 20,
     zoneId: "void_sanctum",
+    bountyRunestones: 145,
   },
   {
     id: "void_progenitor",
@@ -725,6 +766,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["void_heart_gem"],
     prestigeRequirement: 21,
     zoneId: "void_sanctum",
+    bountyRunestones: 180,
   },
   {
     id: "void_emperor",
@@ -742,6 +784,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["sanctum_breaker", "void_emperor_plate"],
     prestigeRequirement: 22,
     zoneId: "void_sanctum",
+    bountyRunestones: 225,
   },
   // ── Eternal Throne ────────────────────────────────────────────────────────
   {
@@ -760,6 +803,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["eternal_armour"],
     prestigeRequirement: 21,
     zoneId: "eternal_throne",
+    bountyRunestones: 115,
   },
   {
     id: "eternal_knight",
@@ -777,6 +821,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["throne_blade"],
     prestigeRequirement: 22,
     zoneId: "eternal_throne",
+    bountyRunestones: 150,
   },
   {
     id: "the_undying",
@@ -794,6 +839,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 23,
     zoneId: "eternal_throne",
+    bountyRunestones: 190,
   },
   {
     id: "apex_sovereign",
@@ -811,6 +857,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 24,
     zoneId: "eternal_throne",
+    bountyRunestones: 235,
   },
   {
     id: "the_apex",
@@ -828,6 +875,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["apex_sword", "apex_plate", "eternity_stone"],
     prestigeRequirement: 25,
     zoneId: "eternal_throne",
+    bountyRunestones: 295,
   },
   // ── Primordial Chaos ──────────────────────────────────────────────────────
   {
@@ -846,6 +894,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 26,
     zoneId: "primordial_chaos",
+    bountyRunestones: 150,
   },
   {
     id: "creation_engine",
@@ -863,6 +912,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 27,
     zoneId: "primordial_chaos",
+    bountyRunestones: 200,
   },
   {
     id: "entropy_avatar",
@@ -880,6 +930,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 29,
     zoneId: "primordial_chaos",
+    bountyRunestones: 265,
   },
   {
     id: "primordial_titan",
@@ -897,6 +948,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["chaos_mantle", "titan_core"],
     prestigeRequirement: 31,
     zoneId: "primordial_chaos",
+    bountyRunestones: 350,
   },
   // ── Infinite Expanse ──────────────────────────────────────────────────────
   {
@@ -915,6 +967,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 33,
     zoneId: "infinite_expanse",
+    bountyRunestones: 200,
   },
   {
     id: "horizon_beast",
@@ -932,6 +985,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 35,
     zoneId: "infinite_expanse",
+    bountyRunestones: 265,
   },
   {
     id: "infinity_construct",
@@ -949,6 +1003,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 37,
     zoneId: "infinite_expanse",
+    bountyRunestones: 350,
   },
   {
     id: "expanse_sovereign",
@@ -966,6 +1021,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["expanse_blade", "void_armour_mk2"],
     prestigeRequirement: 39,
     zoneId: "infinite_expanse",
+    bountyRunestones: 465,
   },
   // ── Reality Forge ─────────────────────────────────────────────────────────
   {
@@ -984,6 +1040,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 41,
     zoneId: "reality_forge",
+    bountyRunestones: 265,
   },
   {
     id: "reality_shaper",
@@ -1001,6 +1058,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 44,
     zoneId: "reality_forge",
+    bountyRunestones: 350,
   },
   {
     id: "creation_prime",
@@ -1018,6 +1076,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 47,
     zoneId: "reality_forge",
+    bountyRunestones: 465,
   },
   {
     id: "reality_architect",
@@ -1035,6 +1094,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["cosmos_blade", "reality_plate"],
     prestigeRequirement: 49,
     zoneId: "reality_forge",
+    bountyRunestones: 615,
   },
   // ── Cosmic Maelstrom ──────────────────────────────────────────────────────
   {
@@ -1053,6 +1113,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 51,
     zoneId: "cosmic_maelstrom",
+    bountyRunestones: 350,
   },
   {
     id: "force_prime",
@@ -1070,6 +1131,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 54,
     zoneId: "cosmic_maelstrom",
+    bountyRunestones: 465,
   },
   {
     id: "maelstrom_god",
@@ -1087,6 +1149,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 57,
     zoneId: "cosmic_maelstrom",
+    bountyRunestones: 615,
   },
   {
     id: "cosmic_annihilator",
@@ -1104,6 +1167,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["maelstrom_edge", "cosmic_plate"],
     prestigeRequirement: 59,
     zoneId: "cosmic_maelstrom",
+    bountyRunestones: 815,
   },
   // ── Primeval Sanctum ──────────────────────────────────────────────────────
   {
@@ -1122,6 +1186,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 61,
     zoneId: "primeval_sanctum",
+    bountyRunestones: 465,
   },
   {
     id: "time_elder",
@@ -1139,6 +1204,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 65,
     zoneId: "primeval_sanctum",
+    bountyRunestones: 615,
   },
   {
     id: "origin_beast",
@@ -1156,6 +1222,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 69,
     zoneId: "primeval_sanctum",
+    bountyRunestones: 815,
   },
   {
     id: "primeval_god",
@@ -1173,6 +1240,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["primeval_blade", "ancient_aegis"],
     prestigeRequirement: 74,
     zoneId: "primeval_sanctum",
+    bountyRunestones: 1080,
   },
   // ── The Absolute ──────────────────────────────────────────────────────────
   {
@@ -1191,6 +1259,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 76,
     zoneId: "the_absolute",
+    bountyRunestones: 615,
   },
   {
     id: "void_convergence",
@@ -1208,6 +1277,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 79,
     zoneId: "the_absolute",
+    bountyRunestones: 815,
   },
   {
     id: "eternal_end",
@@ -1225,6 +1295,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: [],
     prestigeRequirement: 83,
     zoneId: "the_absolute",
+    bountyRunestones: 1080,
   },
   {
     id: "the_absolute_one",
@@ -1242,5 +1313,6 @@ export const DEFAULT_BOSSES: Boss[] = [
     equipmentRewards: ["absolute_blade", "eternity_plate", "omniversal_core"],
     prestigeRequirement: 90,
     zoneId: "the_absolute",
+    bountyRunestones: 1430,
   },
 ];
diff --git a/apps/api/src/data/equipment.ts b/apps/api/src/data/equipment.ts
index 58df11b..f07b6d2 100644
--- a/apps/api/src/data/equipment.ts
+++ b/apps/api/src/data/equipment.ts
@@ -21,6 +21,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 1.25 },
     owned: false,
     equipped: false,
+    setId: "iron_vanguard",
   },
   {
     id: "enchanted_blade",
@@ -42,6 +43,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     owned: false,
     equipped: false,
     cost: { gold: 0, essence: 500, crystals: 0 },
+    setId: "shadow_infiltrator",
   },
   {
     id: "flame_lance",
@@ -52,6 +54,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 1.7 },
     owned: false,
     equipped: false,
+    setId: "volcanic_forger",
   },
   {
     id: "vorpal_sword",
@@ -115,6 +118,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 1.25 },
     owned: false,
     equipped: false,
+    setId: "iron_vanguard",
   },
   {
     id: "hide_armour",
@@ -146,6 +150,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     owned: false,
     equipped: false,
     cost: { gold: 0, essence: 400, crystals: 0 },
+    setId: "shadow_infiltrator",
   },
   {
     id: "volcanic_plate",
@@ -156,6 +161,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 1.65, combatMultiplier: 1.15 },
     owned: false,
     equipped: false,
+    setId: "volcanic_forger",
   },
   {
     id: "dragon_scale",
@@ -208,6 +214,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 1.25 },
     owned: false,
     equipped: false,
+    setId: "iron_vanguard",
   },
   {
     id: "frost_rune",
@@ -248,6 +255,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 1.55, goldMultiplier: 1.1 },
     owned: false,
     equipped: false,
+    setId: "volcanic_forger",
   },
   {
     id: "void_compass",
@@ -259,6 +267,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     owned: false,
     equipped: false,
     cost: { gold: 0, essence: 350, crystals: 0 },
+    setId: "shadow_infiltrator",
   },
   {
     id: "frost_crystal",
@@ -310,6 +319,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 3.5 },
     owned: false,
     equipped: false,
+    setId: "celestial_guardian",
   },
   {
     id: "angels_halo",
@@ -320,6 +330,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 2.75, goldMultiplier: 1.3 },
     owned: false,
     equipped: false,
+    setId: "celestial_guardian",
   },
   {
     id: "celestial_armour",
@@ -330,6 +341,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 2.75 },
     owned: false,
     equipped: false,
+    setId: "celestial_guardian",
   },
   {
     id: "divine_edge",
@@ -361,6 +373,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 4.5 },
     owned: false,
     equipped: false,
+    setId: "abyssal_predator",
   },
   {
     id: "leviathan_eye",
@@ -371,6 +384,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 3.0, goldMultiplier: 1.35 },
     owned: false,
     equipped: false,
+    setId: "abyssal_predator",
   },
   {
     id: "pressure_plate",
@@ -381,6 +395,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 3.25 },
     owned: false,
     equipped: false,
+    setId: "abyssal_predator",
   },
   {
     id: "abyssal_edge",
@@ -412,6 +427,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 3.75 },
     owned: false,
     equipped: false,
+    setId: "infernal_conqueror",
   },
   {
     id: "hellfire_edge",
@@ -422,6 +438,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 5.5 },
     owned: false,
     equipped: false,
+    setId: "infernal_conqueror",
   },
   {
     id: "soul_gem",
@@ -432,6 +449,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 3.25, goldMultiplier: 1.4 },
     owned: false,
     equipped: false,
+    setId: "infernal_conqueror",
   },
   {
     id: "infernal_edge",
@@ -463,6 +481,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 6.5 },
     owned: false,
     equipped: false,
+    setId: "crystal_domain",
   },
   {
     id: "faceted_armour",
@@ -473,6 +492,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 4.5 },
     owned: false,
     equipped: false,
+    setId: "crystal_domain",
   },
   {
     id: "prism_eye",
@@ -483,6 +503,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 3.5, goldMultiplier: 1.5 },
     owned: false,
     equipped: false,
+    setId: "crystal_domain",
   },
   {
     id: "crystal_sovereign_blade",
@@ -514,6 +535,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 8.0 },
     owned: false,
     equipped: false,
+    setId: "void_emperor",
   },
   {
     id: "eternal_shroud",
@@ -524,6 +546,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 5.5 },
     owned: false,
     equipped: false,
+    setId: "void_emperor",
   },
   {
     id: "void_heart_gem",
@@ -534,6 +557,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 4.0, goldMultiplier: 1.6 },
     owned: false,
     equipped: false,
+    setId: "void_emperor",
   },
   {
     id: "sanctum_breaker",
@@ -565,6 +589,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { goldMultiplier: 7.0 },
     owned: false,
     equipped: false,
+    setId: "eternal_throne",
   },
   {
     id: "throne_blade",
@@ -575,6 +600,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { combatMultiplier: 10.0 },
     owned: false,
     equipped: false,
+    setId: "eternal_throne",
   },
   {
     id: "apex_sword",
@@ -605,6 +631,7 @@ export const DEFAULT_EQUIPMENT: Equipment[] = [
     bonus: { clickMultiplier: 5.0, goldMultiplier: 2.0, combatMultiplier: 1.5 },
     owned: false,
     equipped: false,
+    setId: "eternal_throne",
   },
   // ── Purchasable endgame sinks ─────────────────────────────────────────────
   {
diff --git a/apps/api/src/data/equipmentSets.ts b/apps/api/src/data/equipmentSets.ts
new file mode 100644
index 0000000..08575f0
--- /dev/null
+++ b/apps/api/src/data/equipmentSets.ts
@@ -0,0 +1,94 @@
+import type { EquipmentSet } from "@elysium/types";
+
+export const DEFAULT_EQUIPMENT_SETS: EquipmentSet[] = [
+  {
+    id: "iron_vanguard",
+    name: "Iron Vanguard",
+    description: "The armaments of a seasoned guild soldier — proven steel, reliable gold.",
+    pieces: ["iron_sword", "chainmail", "mages_focus"],
+    bonuses: {
+      2: { goldMultiplier: 1.1 },
+      3: { combatMultiplier: 1.1 },
+    },
+  },
+  {
+    id: "shadow_infiltrator",
+    name: "Shadow Infiltrator",
+    description: "Gear forged from the Shadow Marshes themselves — unseen, unstoppable.",
+    pieces: ["shadow_dagger", "void_shroud", "void_compass"],
+    bonuses: {
+      2: { goldMultiplier: 1.15 },
+      3: { clickMultiplier: 1.2 },
+    },
+  },
+  {
+    id: "volcanic_forger",
+    name: "Volcanic Forger",
+    description: "Weapons and armour tempered in the depths of the Volcanic Reaches.",
+    pieces: ["flame_lance", "volcanic_plate", "crystal_shard"],
+    bonuses: {
+      2: { combatMultiplier: 1.15 },
+      3: { goldMultiplier: 1.15 },
+    },
+  },
+  {
+    id: "celestial_guardian",
+    name: "Celestial Guardian",
+    description: "Relics of the Celestial Reaches — divine power made manifest.",
+    pieces: ["seraph_wing", "celestial_armour", "angels_halo"],
+    bonuses: {
+      2: { combatMultiplier: 1.2 },
+      3: { goldMultiplier: 1.2 },
+    },
+  },
+  {
+    id: "abyssal_predator",
+    name: "Abyssal Predator",
+    description: "Trophies reclaimed from the deepest trenches of the Abyssal Reaches.",
+    pieces: ["depth_blade", "pressure_plate", "leviathan_eye"],
+    bonuses: {
+      2: { goldMultiplier: 1.2 },
+      3: { clickMultiplier: 1.25 },
+    },
+  },
+  {
+    id: "infernal_conqueror",
+    name: "Infernal Conqueror",
+    description: "Forged in the heart of the Infernal Court from the essence of the defeated.",
+    pieces: ["hellfire_edge", "demon_hide", "soul_gem"],
+    bonuses: {
+      2: { combatMultiplier: 1.25 },
+      3: { goldMultiplier: 1.25 },
+    },
+  },
+  {
+    id: "crystal_domain",
+    name: "Crystal Domain",
+    description: "Instruments of the Crystalline Spire — reality refracted into absolute efficiency.",
+    pieces: ["prism_blade", "faceted_armour", "prism_eye"],
+    bonuses: {
+      2: { clickMultiplier: 1.25 },
+      3: { goldMultiplier: 1.25 },
+    },
+  },
+  {
+    id: "void_emperor",
+    name: "Void Emperor",
+    description: "The regalia of the Void Sanctum's lord — power carved from absolute nothingness.",
+    pieces: ["void_annihilator", "eternal_shroud", "void_heart_gem"],
+    bonuses: {
+      2: { goldMultiplier: 1.3 },
+      3: { combatMultiplier: 1.3 },
+    },
+  },
+  {
+    id: "eternal_throne",
+    name: "Eternal Throne",
+    description: "The armaments of the Eternal Throne — weapons and armour that have endured all of time.",
+    pieces: ["throne_blade", "eternal_armour", "eternity_stone"],
+    bonuses: {
+      2: { combatMultiplier: 1.35, goldMultiplier: 1.25 },
+      3: { clickMultiplier: 1.35 },
+    },
+  },
+];
diff --git a/apps/api/src/routes/boss.ts b/apps/api/src/routes/boss.ts
index 42d268c..7759c12 100644
--- a/apps/api/src/routes/boss.ts
+++ b/apps/api/src/routes/boss.ts
@@ -1,10 +1,14 @@
 import type { BossChallengeResponse, GameState } from "@elysium/types";
+import { computeSetBonuses } from "@elysium/types";
 import { Hono } from "hono";
+import type { HonoEnv } from "../types/hono.js";
 import { prisma } from "../db/client.js";
+import { DEFAULT_BOSSES } from "../data/bosses.js";
+import { DEFAULT_EQUIPMENT_SETS } from "../data/equipmentSets.js";
 import { authMiddleware } from "../middleware/auth.js";
 import { updateChallengeProgress } from "../services/dailyChallenges.js";
 
-export const bossRouter = new Hono();
+export const bossRouter = new Hono<HonoEnv>();
 
 bossRouter.use("*", authMiddleware);
 
@@ -25,6 +29,9 @@ const calculatePartyStats = (
     .filter((e) => e.equipped && e.bonus.combatMultiplier != null)
     .reduce((mult, e) => mult * (e.bonus.combatMultiplier ?? 1), 1);
 
+  const equippedItemIds = (state.equipment ?? []).filter((e) => e.equipped).map((e) => e.id);
+  const setCombatMultiplier = computeSetBonuses(equippedItemIds, DEFAULT_EQUIPMENT_SETS).combatMultiplier;
+
   let partyDPS = 0;
   let partyMaxHp = 0;
 
@@ -52,7 +59,7 @@ const calculatePartyStats = (
     partyMaxHp += adventurer.level * 50 * adventurer.count;
   }
 
-  partyDPS *= equipmentCombatMultiplier;
+  partyDPS *= equipmentCombatMultiplier * setCombatMultiplier;
 
   return { partyDPS, partyMaxHp };
 };
@@ -185,12 +192,18 @@ bossRouter.post("/challenge", async (context) => {
       state.resources.crystals += crystalsAwarded;
     }
 
+    // First-kill bounty — look up authoritative bounty from static data
+    const staticBoss = DEFAULT_BOSSES.find((b) => b.id === body.bossId);
+    const bountyRunestones = staticBoss?.bountyRunestones ?? 0;
+    state.prestige.runestones += bountyRunestones;
+
     rewards = {
       gold: boss.goldReward,
       essence: boss.essenceReward,
       crystals: boss.crystalReward,
       upgradeIds: boss.upgradeRewards,
       equipmentIds: equipmentRewards,
+      bountyRunestones,
     };
   } else {
     bossHpAtBattleEnd = Math.max(
diff --git a/apps/api/src/routes/game.ts b/apps/api/src/routes/game.ts
index af83fb9..a92f64b 100644
--- a/apps/api/src/routes/game.ts
+++ b/apps/api/src/routes/game.ts
@@ -1,11 +1,14 @@
 import type { GameState, SaveRequest } from "@elysium/types";
+import { computeSetBonuses } from "@elysium/types";
 import { createHmac } from "node:crypto";
 import { Hono } from "hono";
+import type { HonoEnv } from "../types/hono.js";
 import { prisma } from "../db/client.js";
 import { DEFAULT_ACHIEVEMENTS } from "../data/achievements.js";
 import { DEFAULT_ADVENTURERS } from "../data/adventurers.js";
 import { DEFAULT_BOSSES } from "../data/bosses.js";
 import { DEFAULT_EQUIPMENT } from "../data/equipment.js";
+import { DEFAULT_EQUIPMENT_SETS } from "../data/equipmentSets.js";
 import { DEFAULT_QUESTS } from "../data/quests.js";
 import { authMiddleware } from "../middleware/auth.js";
 import { getOrResetDailyChallenges } from "../services/dailyChallenges.js";
@@ -44,6 +47,8 @@ const computeMaxPassiveIncome = (
     (mult, e) => mult * (e.bonus.goldMultiplier ?? 1),
     1,
   );
+  const equippedItemIds = equippedItems.map((e) => e.id);
+  const setGoldMultiplier = computeSetBonuses(equippedItemIds, DEFAULT_EQUIPMENT_SETS).goldMultiplier;
   const runestonesIncome = state.prestige.runestonesIncomeMultiplier ?? 1;
   const runestonesEssence = state.prestige.runestonesEssenceMultiplier ?? 1;
 
@@ -70,7 +75,8 @@ const computeMaxPassiveIncome = (
       upgradeMultiplier *
       prestige *
       runestonesIncome *
-      equipmentGoldMultiplier;
+      equipmentGoldMultiplier *
+      setGoldMultiplier;
 
     essencePerSecond +=
       adventurer.essencePerSecond *
@@ -93,9 +99,11 @@ const computeMaxClickGoldPerSecond = (state: GameState): number => {
     .filter((u) => u.purchased && u.target === "click")
     .reduce((mult, u) => mult * u.multiplier, 1);
 
-  const equipmentClickMultiplier = (state.equipment ?? [])
-    .filter((e) => e.equipped && e.bonus.clickMultiplier != null)
+  const equippedItems = (state.equipment ?? []).filter((e) => e.equipped);
+  const equipmentClickMultiplier = equippedItems
+    .filter((e) => e.bonus.clickMultiplier != null)
     .reduce((mult, e) => mult * (e.bonus.clickMultiplier ?? 1), 1);
+  const setClickMultiplier = computeSetBonuses(equippedItems.map((e) => e.id), DEFAULT_EQUIPMENT_SETS).clickMultiplier;
 
   const runestonesClick = state.prestige.runestonesClickMultiplier ?? 1;
 
@@ -104,7 +112,8 @@ const computeMaxClickGoldPerSecond = (state: GameState): number => {
     clickMultiplier *
     state.prestige.productionMultiplier *
     runestonesClick *
-    equipmentClickMultiplier;
+    equipmentClickMultiplier *
+    setClickMultiplier;
 
   return clickPower * CLICK_BUFFER_CPS;
 };
@@ -284,7 +293,7 @@ const validateAndSanitize = (incoming: GameState, previous: GameState): GameStat
   return { ...incoming, resources, bosses, quests, achievements, prestige };
 };
 
-export const gameRouter = new Hono();
+export const gameRouter = new Hono<HonoEnv>();
 
 gameRouter.use("*", authMiddleware);
 
@@ -610,8 +619,8 @@ gameRouter.post("/save", async (context) => {
 
   await prisma.gameState.upsert({
     where: { discordId },
-    create: { discordId, state: stateToSave, updatedAt: now },
-    update: { state: stateToSave, updatedAt: now },
+    create: { discordId, state: stateToSave as unknown as never, updatedAt: now },
+    update: { state: stateToSave as unknown as never, updatedAt: now },
   });
 
   const signature = secret ? computeHmac(JSON.stringify(stateToSave), secret) : undefined;
diff --git a/apps/web/src/components/game/AboutPanel.tsx b/apps/web/src/components/game/AboutPanel.tsx
index 02c84d4..cf01b37 100644
--- a/apps/web/src/components/game/AboutPanel.tsx
+++ b/apps/web/src/components/game/AboutPanel.tsx
@@ -28,8 +28,8 @@ const HOW_TO_PLAY = [
     body: "New zones unlock when you defeat the final boss AND complete the final quest of the previous zone. Each zone contains new bosses and quests with progressively greater rewards.",
   },
   {
-    title: "🗡️ Equipment",
-    body: "Earn equipment from boss drops and quest rewards. Each piece of equipment provides bonuses to gold income, click power, or adventurer output. Rarer equipment provides stronger bonuses.",
+    title: "🗡️ Equipment & Sets",
+    body: "Earn equipment from boss drops and quest rewards. Each piece provides bonuses to gold income, click power, or combat. Rarer equipment provides stronger bonuses. Equip matching set pieces (2 or 3 of a named set) to unlock escalating set bonuses shown at the top of the Equipment panel.",
   },
   {
     title: "⭐ Prestige",
diff --git a/apps/web/src/components/game/BattleModal.tsx b/apps/web/src/components/game/BattleModal.tsx
index b56243a..82fb252 100644
--- a/apps/web/src/components/game/BattleModal.tsx
+++ b/apps/web/src/components/game/BattleModal.tsx
@@ -133,6 +133,9 @@ export const BattleModal = ({
                     {result.rewards.crystals > 0 && (
                       <span>💎 {formatNumber(result.rewards.crystals)} crystals</span>
                     )}
+                    {result.rewards.bountyRunestones > 0 && (
+                      <span className="battle-bounty">🔮 {formatNumber(result.rewards.bountyRunestones)} runestones (first kill!)</span>
+                    )}
                   </div>
                 )}
               </>
diff --git a/apps/web/src/components/game/BossPanel.tsx b/apps/web/src/components/game/BossPanel.tsx
index 53b3857..52082c5 100644
--- a/apps/web/src/components/game/BossPanel.tsx
+++ b/apps/web/src/components/game/BossPanel.tsx
@@ -70,6 +70,9 @@ const BossCard = ({
         {(boss.equipmentRewards ?? []).length > 0 && (
           <span>🗡️ {boss.equipmentRewards.length} Equipment</span>
         )}
+        {boss.status !== "defeated" && boss.bountyRunestones > 0 && (
+          <span className="boss-bounty">🔮 {boss.bountyRunestones} (first kill)</span>
+        )}
       </div>
 
       {(boss.status === "available" || boss.status === "in_progress") && (
diff --git a/apps/web/src/components/game/EquipmentPanel.tsx b/apps/web/src/components/game/EquipmentPanel.tsx
index e8aa8ee..b348c68 100644
--- a/apps/web/src/components/game/EquipmentPanel.tsx
+++ b/apps/web/src/components/game/EquipmentPanel.tsx
@@ -1,6 +1,7 @@
 import type { Equipment, EquipmentType } from "@elysium/types";
 import { useState } from "react";
 import { useGame } from "../../context/GameContext.js";
+import { EQUIPMENT_SETS } from "../../data/equipmentSets.js";
 import { LockToggle } from "../ui/LockToggle.js";
 
 const RARITY_LABEL: Record<string, string> = {
@@ -36,6 +37,7 @@ interface EquipmentCardProps {
   essence: number;
   crystals: number;
   dropBossName?: string | undefined;
+  setName?: string | undefined;
 }
 
 const costLabel = (cost: { gold: number; essence: number; crystals: number }): string => {
@@ -46,7 +48,7 @@ const costLabel = (cost: { gold: number; essence: number; crystals: number }): s
   return parts.join("  ");
 };
 
-const EquipmentCard = ({ item, gold, essence, crystals, dropBossName }: EquipmentCardProps): React.JSX.Element => {
+const EquipmentCard = ({ item, gold, essence, crystals, dropBossName, setName }: EquipmentCardProps): React.JSX.Element => {
   const { equipItem, buyEquipment } = useGame();
 
   const canAfford = item.cost
@@ -63,6 +65,7 @@ const EquipmentCard = ({ item, gold, essence, crystals, dropBossName }: Equipmen
         </div>
         <p className="equipment-description">{item.description}</p>
         <p className="equipment-bonus">{bonusDescription(item)}</p>
+        {setName && <span className="equipment-set-badge">🔗 {setName}</span>}
         {!item.owned && item.cost && (
           <p className="equipment-cost">{costLabel(item.cost)}</p>
         )}
@@ -121,6 +124,31 @@ export const EquipmentPanel = (): React.JSX.Element => {
     }
   }
 
+  // Build set name lookup for card badges
+  const setNameById = new Map<string, string>(
+    EQUIPMENT_SETS.map((s) => [s.id, s.name]),
+  );
+
+  // Compute active set bonuses for the summary strip
+  const equippedItemIds = equipment.filter((e) => e.equipped).map((e) => e.id);
+  const activeSets = EQUIPMENT_SETS.map((set) => {
+    const count = set.pieces.filter((id) => equippedItemIds.includes(id)).length;
+    return { set, count };
+  }).filter(({ count }) => count >= 2);
+
+  const setBonusDescription = (set: typeof EQUIPMENT_SETS[number], count: number): string => {
+    const parts: string[] = [];
+    for (const threshold of [2, 3] as const) {
+      if (count >= threshold) {
+        const bonus = set.bonuses[threshold];
+        if (bonus.goldMultiplier) parts.push(`+${Math.round((bonus.goldMultiplier - 1) * 100)}% Gold/s (${threshold}pc)`);
+        if (bonus.combatMultiplier) parts.push(`+${Math.round((bonus.combatMultiplier - 1) * 100)}% Combat (${threshold}pc)`);
+        if (bonus.clickMultiplier) parts.push(`+${Math.round((bonus.clickMultiplier - 1) * 100)}% Click (${threshold}pc)`);
+      }
+    }
+    return parts.join(", ");
+  };
+
   return (
     <section className="panel equipment-panel">
       <div className="panel-header">
@@ -132,9 +160,21 @@ export const EquipmentPanel = (): React.JSX.Element => {
         />
       </div>
       <p className="equipment-intro">
-        Equipment drops from bosses and grants passive bonuses. Only one item per slot can be equipped at a time.
+        Equipment drops from bosses and grants passive bonuses. Only one item per slot can be equipped at a time. Equip matching set pieces for bonus effects!
       </p>
 
+      {activeSets.length > 0 && (
+        <div className="active-sets">
+          <h3 className="active-sets-heading">✨ Active Set Bonuses</h3>
+          {activeSets.map(({ set, count }) => (
+            <div key={set.id} className="active-set-row">
+              <span className="active-set-name">{set.name} ({count}/{set.pieces.length})</span>
+              <span className="active-set-bonus">{setBonusDescription(set, count)}</span>
+            </div>
+          ))}
+        </div>
+      )}
+
       {SLOT_ORDER.map((slotType) => {
         const items = equipment.filter(
           (e) => e.type === slotType && (showLocked || e.owned),
@@ -151,6 +191,7 @@ export const EquipmentPanel = (): React.JSX.Element => {
                   essence={state.resources.essence}
                   crystals={state.resources.crystals}
                   dropBossName={equipmentDropSources.get(item.id)}
+                  setName={item.setId ? setNameById.get(item.setId) : undefined}
                 />
               ))}
               {items.length === 0 && (
diff --git a/apps/web/src/data/equipmentSets.ts b/apps/web/src/data/equipmentSets.ts
new file mode 100644
index 0000000..cb6645d
--- /dev/null
+++ b/apps/web/src/data/equipmentSets.ts
@@ -0,0 +1,94 @@
+import type { EquipmentSet } from "@elysium/types";
+
+export const EQUIPMENT_SETS: EquipmentSet[] = [
+  {
+    id: "iron_vanguard",
+    name: "Iron Vanguard",
+    description: "The armaments of a seasoned guild soldier — proven steel, reliable gold.",
+    pieces: ["iron_sword", "chainmail", "mages_focus"],
+    bonuses: {
+      2: { goldMultiplier: 1.1 },
+      3: { combatMultiplier: 1.1 },
+    },
+  },
+  {
+    id: "shadow_infiltrator",
+    name: "Shadow Infiltrator",
+    description: "Gear forged from the Shadow Marshes themselves — unseen, unstoppable.",
+    pieces: ["shadow_dagger", "void_shroud", "void_compass"],
+    bonuses: {
+      2: { goldMultiplier: 1.15 },
+      3: { clickMultiplier: 1.2 },
+    },
+  },
+  {
+    id: "volcanic_forger",
+    name: "Volcanic Forger",
+    description: "Weapons and armour tempered in the depths of the Volcanic Reaches.",
+    pieces: ["flame_lance", "volcanic_plate", "crystal_shard"],
+    bonuses: {
+      2: { combatMultiplier: 1.15 },
+      3: { goldMultiplier: 1.15 },
+    },
+  },
+  {
+    id: "celestial_guardian",
+    name: "Celestial Guardian",
+    description: "Relics of the Celestial Reaches — divine power made manifest.",
+    pieces: ["seraph_wing", "celestial_armour", "angels_halo"],
+    bonuses: {
+      2: { combatMultiplier: 1.2 },
+      3: { goldMultiplier: 1.2 },
+    },
+  },
+  {
+    id: "abyssal_predator",
+    name: "Abyssal Predator",
+    description: "Trophies reclaimed from the deepest trenches of the Abyssal Reaches.",
+    pieces: ["depth_blade", "pressure_plate", "leviathan_eye"],
+    bonuses: {
+      2: { goldMultiplier: 1.2 },
+      3: { clickMultiplier: 1.25 },
+    },
+  },
+  {
+    id: "infernal_conqueror",
+    name: "Infernal Conqueror",
+    description: "Forged in the heart of the Infernal Court from the essence of the defeated.",
+    pieces: ["hellfire_edge", "demon_hide", "soul_gem"],
+    bonuses: {
+      2: { combatMultiplier: 1.25 },
+      3: { goldMultiplier: 1.25 },
+    },
+  },
+  {
+    id: "crystal_domain",
+    name: "Crystal Domain",
+    description: "Instruments of the Crystalline Spire — reality refracted into absolute efficiency.",
+    pieces: ["prism_blade", "faceted_armour", "prism_eye"],
+    bonuses: {
+      2: { clickMultiplier: 1.25 },
+      3: { goldMultiplier: 1.25 },
+    },
+  },
+  {
+    id: "void_emperor",
+    name: "Void Emperor",
+    description: "The regalia of the Void Sanctum's lord — power carved from absolute nothingness.",
+    pieces: ["void_annihilator", "eternal_shroud", "void_heart_gem"],
+    bonuses: {
+      2: { goldMultiplier: 1.3 },
+      3: { combatMultiplier: 1.3 },
+    },
+  },
+  {
+    id: "eternal_throne",
+    name: "Eternal Throne",
+    description: "The armaments of the Eternal Throne — weapons and armour that have endured all of time.",
+    pieces: ["throne_blade", "eternal_armour", "eternity_stone"],
+    bonuses: {
+      2: { combatMultiplier: 1.35, goldMultiplier: 1.25 },
+      3: { clickMultiplier: 1.35 },
+    },
+  },
+];
diff --git a/apps/web/src/engine/tick.ts b/apps/web/src/engine/tick.ts
index a268431..ead2aa1 100644
--- a/apps/web/src/engine/tick.ts
+++ b/apps/web/src/engine/tick.ts
@@ -1,4 +1,6 @@
 import type { Achievement, Equipment, GameState } from "@elysium/types";
+import { computeSetBonuses } from "@elysium/types";
+import { EQUIPMENT_SETS } from "../data/equipmentSets.js";
 import { updateChallengeProgress } from "../utils/dailyChallenges.js";
 
 /**
@@ -57,6 +59,7 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
     (mult, e) => mult * (e.bonus.goldMultiplier ?? 1),
     1,
   );
+  const setGoldMultiplier = computeSetBonuses(equippedItems.map((e) => e.id), EQUIPMENT_SETS).goldMultiplier;
 
   const runestonesIncome = state.prestige.runestonesIncomeMultiplier ?? 1;
   const runestonesEssence = state.prestige.runestonesEssenceMultiplier ?? 1;
@@ -88,6 +91,7 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
       prestige *
       runestonesIncome *
       equipmentGoldMultiplier *
+      setGoldMultiplier *
       deltaSeconds;
 
     essenceGained +=
@@ -228,7 +232,7 @@ export const applyTick = (state: GameState, deltaSeconds: number): GameState =>
       essence: newEssence,
       crystals: capResource(state.resources.crystals + questCrystals + challengeCrystals),
     },
-    dailyChallenges: updatedDailyChallenges,
+    ...(updatedDailyChallenges !== undefined ? { dailyChallenges: updatedDailyChallenges } : {}),
     player: {
       ...state.player,
       totalGoldEarned: newTotalGoldEarned,
@@ -271,9 +275,11 @@ export const calculateClickPower = (state: GameState): number => {
     .filter((u) => u.purchased && u.target === "click")
     .reduce((mult, upgrade) => mult * upgrade.multiplier, 1);
 
-  const equipmentClickMultiplier = (state.equipment ?? [])
-    .filter((e) => e.equipped && e.bonus.clickMultiplier != null)
+  const equippedItems = (state.equipment ?? []).filter((e) => e.equipped);
+  const equipmentClickMultiplier = equippedItems
+    .filter((e) => e.bonus.clickMultiplier != null)
     .reduce((mult, e) => mult * (e.bonus.clickMultiplier ?? 1), 1);
+  const setClickMultiplier = computeSetBonuses(equippedItems.map((e) => e.id), EQUIPMENT_SETS).clickMultiplier;
 
   const runestonesClick = state.prestige.runestonesClickMultiplier ?? 1;
 
@@ -282,6 +288,7 @@ export const calculateClickPower = (state: GameState): number => {
     clickMultiplier *
     state.prestige.productionMultiplier *
     runestonesClick *
-    equipmentClickMultiplier
+    equipmentClickMultiplier *
+    setClickMultiplier
   );
 };
diff --git a/apps/web/src/styles.css b/apps/web/src/styles.css
index 47f0074..ecd1127 100644
--- a/apps/web/src/styles.css
+++ b/apps/web/src/styles.css
@@ -498,6 +498,11 @@ body {
   font-size: 0.9rem;
 }
 
+.boss-bounty {
+  color: #a78bfa;
+  font-weight: bold;
+}
+
 .attack-button {
   align-self: flex-start;
   background: linear-gradient(135deg, #ef4444, #b91c1c);
@@ -862,6 +867,11 @@ body {
   margin: 0.5rem 0;
 }
 
+.battle-bounty {
+  color: #a78bfa;
+  font-weight: bold;
+}
+
 .dismiss-button {
   background: var(--colour-accent);
   border: none;
@@ -945,6 +955,46 @@ body {
   margin-bottom: 1.25rem;
 }
 
+.active-sets {
+  background: rgba(138, 43, 226, 0.08);
+  border: 1px solid rgba(138, 43, 226, 0.3);
+  border-radius: 8px;
+  padding: 0.75rem 1rem;
+  margin-bottom: 1.25rem;
+}
+
+.active-sets-heading {
+  font-size: 0.9rem;
+  font-weight: 600;
+  color: #bf7fff;
+  margin: 0 0 0.5rem;
+}
+
+.active-set-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.4rem 1rem;
+  align-items: baseline;
+  font-size: 0.82rem;
+  margin-bottom: 0.25rem;
+}
+
+.active-set-name {
+  font-weight: 600;
+  color: #d4a0ff;
+}
+
+.active-set-bonus {
+  color: var(--colour-text-muted);
+}
+
+.equipment-set-badge {
+  display: inline-block;
+  font-size: 0.75rem;
+  color: #bf7fff;
+  margin-top: 0.2rem;
+}
+
 .equipment-slot-section {
   margin-bottom: 1.5rem;
 }
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index 80bb3c3..a94c4b1 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -35,6 +35,8 @@ export type {
   EquipmentRarity,
   EquipmentType,
 } from "./interfaces/Equipment.js";
+export type { EquipmentSet, EquipmentSetBonus } from "./interfaces/EquipmentSet.js";
+export { computeSetBonuses } from "./interfaces/EquipmentSet.js";
 export type { GameState } from "./interfaces/GameState.js";
 export type { Player } from "./interfaces/Player.js";
 export type { PrestigeData } from "./interfaces/Prestige.js";
diff --git a/packages/types/src/interfaces/Boss.ts b/packages/types/src/interfaces/Boss.ts
index f670fc0..2df28e8 100644
--- a/packages/types/src/interfaces/Boss.ts
+++ b/packages/types/src/interfaces/Boss.ts
@@ -23,4 +23,6 @@ export interface Boss {
   prestigeRequirement: number;
   /** Zone this boss belongs to */
   zoneId: string;
+  /** One-time runestone bounty awarded on first-ever defeat */
+  bountyRunestones: number;
 }
diff --git a/packages/types/src/interfaces/Equipment.ts b/packages/types/src/interfaces/Equipment.ts
index 723148e..4c05496 100644
--- a/packages/types/src/interfaces/Equipment.ts
+++ b/packages/types/src/interfaces/Equipment.ts
@@ -24,4 +24,6 @@ export interface Equipment {
   equipped: boolean;
   /** If set, this item can be purchased directly rather than obtained via boss drops */
   cost?: { gold: number; essence: number; crystals: number };
+  /** Equipment set this item belongs to, if any */
+  setId?: string;
 }
diff --git a/packages/types/src/interfaces/EquipmentSet.ts b/packages/types/src/interfaces/EquipmentSet.ts
new file mode 100644
index 0000000..23b389d
--- /dev/null
+++ b/packages/types/src/interfaces/EquipmentSet.ts
@@ -0,0 +1,44 @@
+export interface EquipmentSetBonus {
+  goldMultiplier?: number;
+  combatMultiplier?: number;
+  clickMultiplier?: number;
+}
+
+export interface EquipmentSet {
+  id: string;
+  name: string;
+  description: string;
+  /** Equipment IDs that make up this set */
+  pieces: string[];
+  bonuses: {
+    2: EquipmentSetBonus;
+    3: EquipmentSetBonus;
+  };
+}
+
+/**
+ * Given a list of equipped item IDs and a set catalogue, returns the combined
+ * multiplicative bonuses granted by all active set bonuses.
+ */
+export const computeSetBonuses = (
+  equippedItemIds: string[],
+  sets: EquipmentSet[],
+): { goldMultiplier: number; combatMultiplier: number; clickMultiplier: number } => {
+  let goldMultiplier = 1;
+  let combatMultiplier = 1;
+  let clickMultiplier = 1;
+
+  for (const set of sets) {
+    const count = set.pieces.filter((id) => equippedItemIds.includes(id)).length;
+    for (const threshold of [2, 3] as const) {
+      if (count >= threshold) {
+        const bonus = set.bonuses[threshold];
+        goldMultiplier *= bonus.goldMultiplier ?? 1;
+        combatMultiplier *= bonus.combatMultiplier ?? 1;
+        clickMultiplier *= bonus.clickMultiplier ?? 1;
+      }
+    }
+  }
+
+  return { goldMultiplier, combatMultiplier, clickMultiplier };
+};
diff --git a/packages/types/tsconfig.json b/packages/types/tsconfig.json
index 2671502..cd8d3b0 100644
--- a/packages/types/tsconfig.json
+++ b/packages/types/tsconfig.json
@@ -5,5 +5,5 @@
     "rootDir": ".",
     "declaration": true
   },
-  "exclude": ["test/**/*.ts"]
+  "exclude": ["test/**/*.ts", "prod/**"]
 }