feat: add equipment set bonuses and boss bounty runestones

- Define EquipmentSet type + computeSetBonuses utility in packages/types
- Add setId field to Equipment type and assign sets to 27 equipment items
- Create 9 named equipment sets (Iron Vanguard → Eternal Throne) with 2pc/3pc bonuses
- Apply set combat multiplier in boss route
- Apply set gold/click multipliers in tick engine and click handler
- Include set bonuses in anti-cheat delta validation
- Show active set bonus strip + set badge per card in EquipmentPanel
- Add boss first-kill bounty runestones (scaling 1–10 per boss tier)
- Update AboutPanel and IDEAS.md

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",

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>
                 )}
               </>

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") && (

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 && (