Aeonglass is one of the three act 3 bosses in Slay the Spire 2, in Glory. It replaced Doormaker in the 18 June 2026 update. It is the third boss in act 3's first-time order, after Queen and Test Subject. See act 3 bosses.
HP
| Normal | From Ascension 8 | |
|---|---|---|
| HP | 512 | 535 |
It starts the fight with 3 Artifact, which blocks the first 3 debuffs you apply.
Moves
Aeonglass repeats the same three moves in order, starting with Ebb:
| Move | Effect | From Ascension 9 |
|---|---|---|
| Ebb | 26 damage and gains 33 Block | 32 damage |
| Eye Lasers | 11 damage twice | 12 damage twice |
| Increasing Intensity | Upgrades every Wither you have, adds 1 Wither to your discard pile, gains 3 Strength | 2 Wither, 4 Strength |
Each Increasing Intensity gains 1 more Strength than the last: 3, then 4, then 5 (4, 5, 6 from Ascension 9). Strength adds to both attacks.
Wither and Withering Presence
When the fight starts, you get Withering Presence 6: every 6 cards you play, a Wither is added to your hand.
Wither is an unplayable status card. If it is in your hand at the end of your turn, you take 3 damage. Each Increasing Intensity upgrades every Wither you have by 3 more damage, including ones added later in the fight.
In co-op
Act 3 boss HP is multiplied by the number of players and by 1.3: ×2.6 for two players, ×3.9 for three and ×5.2 for four. See co-op scaling.