Goat Head

Effects

A Devil Room / Angel Room Door will always spawn after every boss fight, excluding first floor and floors after Chapter 4.
- The spawned door will not disappear when leaving and re-entering the boss room.

The precise effect involves setting the Devil Room chance to 100%, regardless of other effects.
- Even if taken after a boss is killed, Goat Head will force a Devil / Angel Room door to spawn on that floor.
Accepting a deal with the Devil will prevent any Angel Rooms from appearing, meaning that Isaac needs to acquire the Goat Head in a Curse Room,(Removed in Repentance) Locked Chest,(Removed in Afterbirth)Red Chest, from The Fallen or with (Credit Card) Credit Card, which would allow Angel Rooms to open.
- Getting deals from satanic bible now affects the Angel rooms chance.
(Removed in Afterbirth) Goat Head and The Book of Belial are the only items that will ensure Angel/Devil Rooms on every floor between The Basement I and Utero II.
(Added in Afterbirth / Removed in Repentance) Goat Head will not force a Devil / Angel Room door to open if the boss fight was in a narrow room.
(Added in Afterbirth) Goat Head has no effect in Greed mode and is not normally available.
- It can still be a starting item for (Eden) Eden, a bonus item from (Added in Afterbirth) Eden's Blessing and is obtainable with Pandora's Box and (Added in Afterbirth †) Sacrificial Altar.

(Added in Afterbirth)(Black Feather) Black Feather: Grants a damage boost
(Added in Afterbirth †) Duality: Both Angel and Devil Room doors spawn after every boss, and the selected door will never disappear.

(Added in Afterbirth †) Eucharist: Overrides Goat Head.
(Added in Repentance) (Tainted Lazarus) Tainted Lazarus: Fighting the boss as the Lazarus with Goat Head will spawn the door immediately. Fighting the boss as the other Lazarus will spawn the door when you leave the room and re-enter.