Gish is a boss that can appear in Error: The given stage ("The Depths") does not exist. and the 
Dank Depths. It is the alternative version of Monstro II.
Behavior
- Hops towards the player, similar to Monstro.
- Fires an explosive projectile towards the player, leaving a large puddle of black creep.
- Leaps off-screen and lands on Isaac's position twice in a row, similar to Monstro II.
- Leaves a large puddle of black creep after landing the first time.
- The Black Creep spawned by Gish's first jump will remain for the entire battle until Gish is killed.
- Spawns two Clots after landing the second time.
- Only two Clots can be in the room.
- Leaves a large puddle of black creep after landing the first time.
Gallery
Gish ingame.
Gish firing an explosive shot.
Gish as one of Delirium's forms.
Unlockable Achievements
- Little Gish - Defeat Gish.
Notes
- Gish will often be accompanied by Clotties.
- Unlike Monstro, if Isaac is somewhere that Gish cannot reach, he will stay stationary.
Trivia
- Gish appeared in the original The Binding of Isaac.
- The item Ball of Tar gives the player a Gish-like appearance.
- The enemy Clots are tiny Gishes.
- Gish is the protagonist of the 2004 PC game Gish, created by Edmund McMillen.
- Gish is the only boss to be an alternate version of a posthumous boss, being Monstro II's alternative.
- Gish can be found in The Void, even before being unlocked.
Gish can be found in 
 The Binding of Isaac: Rebirth
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