diff --git a/apps/api/src/data/upgrades.ts b/apps/api/src/data/upgrades.ts
index 8256d65..28e14eb 100644
--- a/apps/api/src/data/upgrades.ts
+++ b/apps/api/src/data/upgrades.ts
@@ -297,23 +297,10 @@ export const defaultUpgrades: Array<Upgrade> = [
     target:     "adventurer",
     unlocked:   false,
   },
-  {
-    adventurerId: "shadow_assassin",
-    costCrystals: 0,
-    costEssence:  175,
-    costGold:     0,
-    description:  "Mastery of the shadow arts doubles assassin effectiveness.",
-    id:           "shadow_assassin_1",
-    multiplier:   2,
-    name:         "Shadow Arts",
-    purchased:    false,
-    target:       "adventurer",
-    unlocked:     false,
-  },
   {
     adventurerId: "arcane_scholar",
     costCrystals: 0,
-    costEssence:  150,
+    costEssence:  1000,
     costGold:     0,
     description:  "Access to forbidden libraries doubles scholar output.",
     id:           "arcane_scholar_1",
@@ -323,10 +310,23 @@ export const defaultUpgrades: Array<Upgrade> = [
     target:       "adventurer",
     unlocked:     false,
   },
+  {
+    adventurerId: "shadow_assassin",
+    costCrystals: 0,
+    costEssence:  5000,
+    costGold:     0,
+    description:  "Mastery of the shadow arts doubles assassin effectiveness.",
+    id:           "shadow_assassin_1",
+    multiplier:   2,
+    name:         "Shadow Arts",
+    purchased:    false,
+    target:       "adventurer",
+    unlocked:     false,
+  },
   {
     adventurerId: "dark_templar",
     costCrystals: 0,
-    costEssence:  200,
+    costEssence:  25_000,
     costGold:     0,
     description:
       "A sworn oath to the darkness of the marshes doubles templar output.",
@@ -340,7 +340,7 @@ export const defaultUpgrades: Array<Upgrade> = [
   {
     adventurerId: "void_walker",
     costCrystals: 0,
-    costEssence:  300,
+    costEssence:  100_000,
     costGold:     0,
     description:
       "Walking through the void itself doubles the output of your void walkers.",
@@ -354,7 +354,7 @@ export const defaultUpgrades: Array<Upgrade> = [
   {
     adventurerId: "celestial_guard",
     costCrystals: 0,
-    costEssence:  750,
+    costEssence:  500_000,
     costGold:     0,
     description:
       "A blessing from the celestials themselves doubles guard output.",
@@ -368,7 +368,7 @@ export const defaultUpgrades: Array<Upgrade> = [
   {
     adventurerId: "divine_champion",
     costCrystals: 0,
-    costEssence:  2000,
+    costEssence:  2_000_000,
     costGold:     0,
     description:  "An unbreakable oath to the divine doubles champion output.",
     id:           "divine_champion_1",