- Isaac builds up rage every time he clears a room, which is indicated by the patch of skin that spreads around his face.
- After four rooms, Isaac's head will start to flash red; upon entering a room with enemies, he will fire a large Brimstone laser for ~3.33 seconds.
- The laser deals Isaac's damage per tick (15x Isaac's damage per second).
- This item has no effect in Greed Mode.
- This item is, most likely, Azazel's severed right horn.
- This item resembles one of the horns of The Beast.
|The Binding of Isaac: Rebirth|
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