← Boss Cheat Sheet

Aeonglass

Act 3 β€” The Beyond Β· HP: 512

High
⚠️Never let Withers pile up in hand β€” each unplayed Wither deals 2 damage at end of turn. Multiple retained Withers kill faster than any attack.
Key Mechanics
  • β€’Withering Presence (passive): every 4th non-Status card you play adds a Wither to your discard pile.
  • β€’Wither cards in hand at end of turn deal 2 damage each β€” they accumulate fast over a long fight.
  • β€’Opens with Artifact 3 β€” your first 3 debuffs are wasted. Strip Artifact before applying Weak or Vulnerable.
Strategy

Play efficiently β€” fewer, high-impact cards per turn means fewer Withers generated. Build in Exhaust or discard tools to purge Withers. Kill before Increasing Intensity fires too many times, or its Strength snowball makes blocking impossible.

Moves
Ebb(26 dmg)Single-hit attack. Grants itself Block.
Eye Lasers(11 dmg)Hits twice for 11 damage.
Increasing IntensityGrants 33 Block + 3 Strength to itself. Adds a Wither to your discard pile.
Aeonglass Boss Guide β€” Slay the Spire 2 | STS2 Guide