Game Mechanics
Every drop rate, reward chance, and game formula extracted from Slay the Spire 2's decompiled source code. All values are exact.
Mechanics
Card Rarity Odds
Card rarity probabilities for normal fights, elite fights, boss fights, and shops. Includes rare card pity system and ascension modifiers.
Relic Rarity Distribution
Relic rarity chances from elite fights, treasure rooms, and shops. Common 50%, Uncommon 33%, Rare 17%.
Potion Drop Rates
Potion drop chances from combat with an adaptive pity system. Starts at 40%, ±10% per combat (down on a drop, up on a miss), no hard cap. Elites add a 12.5% effective drop bonus, but any drop still moves pity down 10%.
Gold Rewards
Exact gold reward ranges for normal fights (10-20), elite fights (35-45), boss fights (100), and treasure rooms (42-52).
Shop Inventory
Shop layout — 5 character cards, 2 colorless, 3 relics, 3 potions, card removal scaling (75 + 25n gold).
Map Generation
How the map is built — act structure, room counts, elite placement rules, and room distribution.
Unknown Room Probabilities
What happens when you enter a "?" room, including the adaptive odds for events, fights, shops, and treasure, and the between-acts reset.
Bosses & Elites by Act
Which 3 bosses and 3 elites can appear in each act — Overgrowth, Underdocks, Hive, and Glory.
Combat Mechanics
Hand size (5 draw, 10 max), energy (3 base), block decay, damage formulas — Strength, Dexterity, Vulnerable, Weak, Frail.
Character Starting Stats
Starting HP, gold, deck size, and orb slots for Ironclad, Silent, Defect, Necrobinder, and Regent.
Orb Mechanics
Defect orb system — Lightning, Frost, Dark, Plasma, and Glass passive and evoke values. 3 starting slots, 10 max.
Campfire Options
All 9 rest site choices - Rest, Smith, Dig, Lift, Cook, Clone, Hatch, Mend, and Kindle. Some require specific relics or cards.
Neow Offerings
Starting Ancient Neow offers 3 relics — 2 positive and 1 curse. Full relic pools and conflict prevention rules.
Ascension Modifiers
All 10 ascension levels and their effects — from Swarming Elites (A1) to Double Boss (A10).
Enemy Ascension Scaling
Per-monster HP and damage bumps applied at ToughEnemies (A8) and DeadlyEnemies (A9). Sortable table covering every monster in the bestiary.
Scoring & Daily Leaderboards
How your run score is calculated — 10 points per room, act multipliers, elite/boss/gold bonuses, and ascension scaling. Plus the packed daily-leaderboard score format added in Major Update
Secrets & Trivia
The Foul Potion Has 3 Uses
The most context-sensitive item in the game — combat damage, merchant gold, and Fake Merchant boss trigger.
Wongo's Cross-Run Loyalty Points
A hidden loyalty system that persists across runs. Earn points toward a badge relic, but leaving without buying downgrades a card.
Crystal Sphere Minesweeper
The Crystal Sphere event is a hidden-object minigame on an 11x11 grid with relics, potions, cards, and a hidden curse.
The Reflections Event Can Double Your Deck
The Shatter option clones every card in your deck 1:1, doubling its size. The catch — a Bad Luck curse.
The Architect Can't Fight You
The final encounter has 9,999 HP but can't attack. It's a dialogue scene where your score determines the visual damage.
Orobas and the Prismatic Gem
The Ancient Orobas in Act 2 has a ~8% chance to offer the Prismatic Gem — 33% chance it enters the pool, then 1-in-4 to be picked.
Byrdpip Is Invincible and Does Nothing
The Byrdpip pet has 9,999 HP, a hidden health bar, and its only move is NOTHING_MOVE. It has 4 random skins.
Five Relics Are Banned From Shops
The Courier, Old Coin, Lucky Fysh, Bowler Hat, and Amethyst Aubergine are hardcoded into the merchant blacklist, so they can never appear in shops.
The Game Has a Built-In AI Player
AutoSlay is a full automated player for CI testing — picks a random character, plays to floor 49 with a 25-minute timeout.
Dev Console God Mode
39 developer console commands including godmode (~1 billion (999,999,999) Strength + Buffer + Regen), instant death, and trailer mode.
The Deprived: A Hidden Test Character
A debug character with 1,000 HP, 100 energy, an empty deck, and no relics. Purple color scheme, neutral gender.