Slay the Spire: 10 Essential Tips for Ascension 20 Success

Introduction

Ascension 20 in Slay the Spire is the ultimate test of skill, resilience, and strategy. With tougher enemies, fewer rewards, and the dreaded Blight from the first boss, every decision matters. Whether you're an Ironclad veteran or a Defect devotee, these ten tips will sharpen your run and help you finally claim that A20 heart kill.

1. Value Card Removal Over Additions

In high Ascension, a thin deck is your best friend. Prioritize removing Strikes and Defends at shops or events. The less junk you draw, the more often you see your powerful cards. Aim for a deck of 20–35 cards depending on your archetype.

2. Act 1 Is About Damage

The first act's elites (Gremlin Nob, Lagavulin) and bosses (Hexaghost, Slime Boss, Guardian) demand burst damage. Pick up attacks early—even mediocre ones like Pommel Strike or Dagger Spray—to survive. Don't overvalue scaling; raw damage keeps you alive.

3. Know When to Skip a Card Reward

Not every card reward needs picking. Adding a card dilutes your deck; if none of the three improve your strategy or address a weakness, skip. This is especially crucial after crucial picks like Corruption or Electrodynamics.

4. Master Pathing and Rest Sites

Plan your route to maximize elites while avoiding death. On A20, aim for 2–3 elites in Act 1 if your deck can handle them. Rest sites should be used primarily for Upgrading key cards—resting heals only 30 HP and is less impactful later. Save rests for when you're truly low.

5. Respect Potions

Potions are game-changers. Save them for tough fights: Fire Potion can burst down Gremlin Nob; Ghost in a Jar (Intangible) lets you survive a massive hit. Learn each potion's value and don't be afraid to buy them at shops.

6. Relics Over Gold Late Game

In Act 3 and 4, gold becomes less valuable. Spending 100+ gold on a common relic at a shop often outperforms saving for a card. Relics scale with your whole run and provide permanent bonuses. The Dead Branch, Tungsten Rod, or Incense Burner can single-handedly win runs.

7. Don't Ignore Events

Many events offer powerful rewards. The Addict event can give a rare relic for a small curse; the Mushroom event provides strength if you have a curse. Always read the options, and learn which events are worth the risk. The Joust event (50% chance for 175 gold) is often worth it for the gold.

8. Block Is a Non-Negotiable

By Act 2, you need reliable block. Don't rely on just one or two block cards. Cards like Leg Sweep (Silent), Shrug It Off (Ironclad), or Charge Battery (Defect) are essential. Also, Disarm and Malaise can neutralize dangerous enemies. Build a defensive shell that can handle multi-hit attacks.

9. Synergies Over Raw Stats

Chasing high-damage numbers without synergy leads to failure. The Ironclad's Body Slam needs block generation; the Silent's Finisher needs Shivs; the Defect's Hyperbeam works best with focus. Identify your win condition early and draft toward it. The Watcher is a separate beast—learn her retain and stance mechanics.

10. Never Force an Archetype

Let the run guide you. If you get Shiv synergy early, go all-in. If you see After Image and Cloak and Dagger, pivot. A20 punishes forcing a build (e.g., Demon Form without energy). Stay flexible, and always have a plan for the Heart: you'll need high damage burst or scaling block by Act 4.

Conclusion

Ascension 20 is brutal, but with practice and these tips, you'll reach the Heart more consistently. Remember: sometimes the best play is to skip, to upgrade, or to buy a potion. Keep climbing, and don't be afraid to lose—it's part of the journey to mastering the Spire.