Ascension 20: The Final Challenge
Slay the Spire 2's Ascension system goes to A20. Each level adds a stacking difficulty modifier:
- A1-A5: Enemies deal more damage, have more HP, Elites appear more often
- A6-A10: Start each act damaged, potion slots reduced, events become worse
- A11-A15: Bosses are upgraded, healing is reduced, shop prices increase
- A16-A19: Enemies have new attack patterns, normal enemies become elite-level threats
- A20: Double Act 3 boss — you must defeat two consecutive bosses without healing in between
Tier List: Best Cards at High Ascension
Ironclad — Must-Pick Cards
| Card | Rarity | Why It's Essential |
|---|---|---|
| Corruption | Rare | Wins runs by itself with Feel No Pain |
| Feed | Rare | Permanent max HP gain is priceless at A17+ |
| Reaper | Rare | Only reliable sustain, heals for 100+ with strength scaling |
| Impervious | Rare | 30 block for 2 energy solves any turn defensively |
| Offering | Rare | 6 HP for 3 cards + 2 energy is always worth it |
Silent — Must-Pick Cards
| Card | Rarity | Why It's Essential |
|---|---|---|
| Wraith Form | Rare | 3 turns of near-invincibility. Hallway fight winner. |
| Catalyst+ | Uncommon | Triple poison = dead boss. The only scaling you need. |
| After Image | Rare | Free block on every card played. Shiv decks essential. |
| Malaise | Rare | Permanent strength reduction on enemy. Hard counters certain bosses. |
| Adrenaline | Rare | 0-cost draw 2, gain 1 energy. Never a bad pickup. |
Universal Must-Pick Relics
- Snecko Eye: +2 draw per turn, randomizes costs. The most run-defining boss relic. Take it and draft high-cost cards.
- Dead Branch: Add random card to hand whenever a card exhausts. Turns Corruption into an instant win.
- Mummified Hand: Powers make a random card cost 0. Defect's channel all orbs for free.
- Incense Burner: Every 6 turns, gain Intangible for 1 turn. Time it to block boss attacks.
- Fossilized Helix: Prevent all damage from the first hit each combat. Saves 20-40 HP per act.
A20 Heart Kill Checklist
Before you can face the Heart at A20, ask yourself:
- Can I block 60+ damage in a single turn? The Heart's multi-hit (67 damage) appears every 3 turns.
- Do I have scaling that outpaces the Heart's 800 HP? 800 HP with 200 HP healed each buff cycle demands consistent damage.
- Can I survive 2 turns of Beat of Death? Every card you play deals 1 (A19+: 2) damage to you. Shiv and Claw builds suffer most.
- Did I save a valuable potion? Ghost in a Jar (Intangible), Duplication Potion (Catalyst), or Gambler's Brew (re-draw hand).
📝 Note: A20 Heart kills have a sub-5% success rate even for experienced players. Don't measure progress by wins — measure by better decisions. A run where you identified your mistakes is a successful run.