Leviathan

Isaac turns into a Lovecraftian horror, gains 2 black hearts, and gains flight after picking up three of these items.

Activated Collectibles[edit | edit source]

Name	ID	Icon	Quote	Description
The Nail	83		Temporary demon form	Adds one soul heart and allows the breaking of rocks and damaging enemies by simply walking over them. Increases damage and decreases speed. All effects except for the Soul Heart wear off upon leaving the room.

Name	ID	Quote	Description
Abaddon	230	Evil + DMG up + fear shot	Increases damage and speed, removes all Red Heart containers, grants six Black Hearts, and adds a chance to shoot fear tears.
Brimstone	118	Blood laser barrage	Tears are replaced by a laser beam that pierces through all enemies and obstacles in its path and deals high damage. Can only be fired after a short charge-up period.
Pentagram	51	DMG up	Increases damage and increases the chance for a Devil or Angel Room to appear.
Spirit of the Night	159	Scary	Grants spectral tears and flight.
The Mark	79	DMG up	Increases Damage and Speed, plus adds one Soul Heart.
The Pact	80	DMG + Tears UP	Increases damage by 0.5, tears by 0.7 and grants two soul hearts upon pickup.
Maw of the Void	399	Consume thy enemy!	+1.0 Damage Up. After continuously firing tears for 2.5 seconds, a red cross appears on Isaac's head that, upon releasing the fire button, creates a black ring that rapidly deals damage equal to Isaac's tear damage to any enemies in contact with it.

Concept art for Leviathan along with other transformations that would be implemented into the Afterbirth DLC, by Edmund McMillen. Note that "Sistanis" is an early name of this transformation concept.

This transformation is based on the biblical creature of the same name.
This transformation was initially misspelled as "Levathian" in Afterbirth but has been fixed in Afterbirth+.