Gives the character with demonic features such as grey-colors, red eyes, and a wide, toothy grin.
- + 1.0 damage.
- + 0.5 tear height.
- When the firing key(s) is/are held down for at least three seconds, an inverted red cross appears on Isaac's forehead.
- After those three seconds and the firing key(s) is/are released, a black pulsing ring appears and damages enemies inside of it.
- Marked: The crosshair must be moved for three seconds for the ring to appear.
- Spoon Bender: The ring will curve towards enemies.
- Mom's Contacts: Enemies inside the ring will quickly be frozen.
- Serpent's Kiss: Poisoned enemies will have a higher chance of dropping black hearts.
- The ring is affected by Isaac's damage, range, and being able to inflict effects.
- Blindfolded characters can not activate the ring, but this can be bypassed by picking up The Ludovico Technique.
- Lilith cannot activate the ring, but the stat boosts still apply to Incubus.