Corrupt Heart
The true final boss, waiting in Act 4 behind the three keys.
The Corrupt Heart is the final boss of Slay the Spire, fought in the optional Act 4. It has 750 HP (800 on Ascension 9 and up), and its Invincible buff caps the damage it can take in a single turn at 300, so burst-heavy strategies lose much of their edge. Its Beat of Death buff also hurts the player each time a card is played.
Background
It always opens with Debilitate, applying Vulnerable, Weak and Frail and shuffling a set of status cards into your draw pile. From turn 4 it uses Buff every three turns, and from its fourth Buff onward the Strength it gains becomes enormous, so ending the fight quickly matters.
More in Ascenders & Bosses
Elsewhere in Slay the Spire
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