Hollow Fossil
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Hollow Fossil is a rock trinket added in The Spitshine Update.
Effects
- +1.35 damage.
- Crush Effect: Guarantees a
Devil Room or 
Angel Room to appear after clearing the 
Boss Room of the floor, and the crush rewards from the 
Bismuth Golem spawns 
Black Hearts instead of 
Soul Hearts.
- The spawned door will not disappear when leaving and re-entering the Boss Room.
Notes
- The precise effect of Hollow Fossil involves setting the Deal chance to 100%, regardless of other effects, and will force the Devil Room or Angel Room door to appear even after the boss has already been defeated.
Interactions
Trinket Multipliers / 
Henge Rock: Multiplies the damage granted by Hollow Fossil.
Azurite Spindown: Using Azurite Spindown on Hollow Fossil rerolls it into 
Thank-You Fossil.
Trivia
- Hollow Fossil is a reference to the Metroidvania video game, Hollow Knight.
