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Can You Remove The Crimson Curse? [Solved]
It is only found in the Crimson Court DLC. The Curse is automatically removed from all heroes in your roster after slaying a Courtyard Boss. The ability to cure it through the Sanitarium will become permanently available once the Countess is slain.
Darkest Dungeon - Crimson Court DLC: The Crimson Curse Explained!
Welcome to Rantry’s playthough of the Darkest Dungeon DLC,
Return to the Darkest Dungeon (11) – Curing the Crimson Curse
Some good news after this play of the Darkest Dungeon, I managed to
Crimson Court and You: Darkest Dungeon Guide
This video