From 55a521a7591231f33c642bd8bed3c6caa7659b6e Mon Sep 17 00:00:00 2001
From: Hikari <hikari@nhcarrigan.com>
Date: Mon, 6 Apr 2026 18:44:44 -0700
Subject: [PATCH] balance: increase runestone yield and reduce income_10/11
 costs (closes #166, #170)

---
 apps/api/src/data/prestigeUpgrades.ts   |  4 ++--
 apps/api/src/services/prestige.ts       |  2 +-
 apps/api/test/services/prestige.spec.ts | 14 +++++++-------
 apps/web/src/engine/tick.ts             |  2 +-
 4 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/apps/api/src/data/prestigeUpgrades.ts b/apps/api/src/data/prestigeUpgrades.ts
index 6d33eb0..d314cbc 100644
--- a/apps/api/src/data/prestigeUpgrades.ts
+++ b/apps/api/src/data/prestigeUpgrades.ts
@@ -96,7 +96,7 @@ export const defaultPrestigeUpgrades: Array<PrestigeUpgrade> = [
     id:             "income_10",
     multiplier:     200,
     name:           "Eternal Rune I",
-    runestonesCost: 22_500,
+    runestonesCost: 15_000,
   },
   {
     category: "income",
@@ -105,7 +105,7 @@ export const defaultPrestigeUpgrades: Array<PrestigeUpgrade> = [
     id:             "income_11",
     multiplier:     500,
     name:           "Eternal Rune II",
-    runestonesCost: 60_000,
+    runestonesCost: 35_000,
   },
   // ── Click Power ───────────────────────────────────────────────────────────
   {
diff --git a/apps/api/src/services/prestige.ts b/apps/api/src/services/prestige.ts
index 4fd106e..6ec8d2b 100644
--- a/apps/api/src/services/prestige.ts
+++ b/apps/api/src/services/prestige.ts
@@ -15,7 +15,7 @@ import type {
 } from "@elysium/types";
 
 const basePrestigeGoldThreshold = 1_000_000;
-const runestonesPerPrestigeLevel = 15;
+const runestonesPerPrestigeLevel = 20;
 const milestoneInterval = 5;
 const milestoneRunestonesPerInterval = 25;
 
diff --git a/apps/api/test/services/prestige.spec.ts b/apps/api/test/services/prestige.spec.ts
index 90fbddf..95e71bc 100644
--- a/apps/api/test/services/prestige.spec.ts
+++ b/apps/api/test/services/prestige.spec.ts
@@ -102,25 +102,25 @@ describe("isEligibleForPrestige", () => {
 
 describe("calculateRunestones", () => {
   it("calculates basic runestones formula", () => {
-    // floor(cbrt(4_000_000 / 1_000_000)) × 15 = floor(cbrt(4)) × 15 = 1 × 15 = 15
+    // floor(cbrt(4_000_000 / 1_000_000)) × 20 = floor(cbrt(4)) × 20 = 1 × 20 = 20
     const result = calculateRunestones({ totalGoldEarned: 4_000_000, prestigeCount: 0, purchasedUpgradeIds: [] });
-    expect(result).toBe(15);
+    expect(result).toBe(20);
   });
 
   it("applies echo runestone multiplier", () => {
-    // floor(cbrt(4)) × 15 = 15; × 2 = 30
+    // floor(cbrt(4)) × 20 = 20; × 2 = 40
     const result = calculateRunestones({ totalGoldEarned: 4_000_000, prestigeCount: 0, purchasedUpgradeIds: [], echoRunestoneMultiplier: 2 });
-    expect(result).toBe(30);
+    expect(result).toBe(40);
   });
 
   it("applies purchased runestone upgrade multiplier", () => {
-    // With "runestone_gain_1" purchased (multiplier 1.25): floor(15 × 1.25) = 18
+    // With "runestone_gain_1" purchased (multiplier 1.25): floor(20 × 1.25) = 25
     const result = calculateRunestones({ totalGoldEarned: 4_000_000, prestigeCount: 0, purchasedUpgradeIds: ["runestone_gain_1"] });
-    expect(result).toBe(18);
+    expect(result).toBe(25);
   });
 
   it("caps base runestones before multipliers", () => {
-    // cbrt(9_261_000_000 / 1_000_000) = cbrt(9261) = 21 → 21 × 10 = 210, capped at 200
+    // cbrt(9_261_000_000 / 1_000_000) = cbrt(9261) = 21 → 21 × 20 = 420, capped at 200
     const result = calculateRunestones({ totalGoldEarned: 9_261_000_000, prestigeCount: 0, purchasedUpgradeIds: [] });
     expect(result).toBe(200);
   });
diff --git a/apps/web/src/engine/tick.ts b/apps/web/src/engine/tick.ts
index 2be1ba7..6596555 100644
--- a/apps/web/src/engine/tick.ts
+++ b/apps/web/src/engine/tick.ts
@@ -451,7 +451,7 @@ export const computePartyCombatPower = (state: GameState): number => {
 };
 
 const basePrestigeThreshold = 1_000_000;
-const runestonesPerPrestigeLevelClient = 15;
+const runestonesPerPrestigeLevelClient = 20;
 const maxBaseRunestones = 200;
 
 /**