- In all environments of Chapter 2 ( Caves, Catacombs, Flooded Caves).
- Only in Catacombs and the Flooded Caves.
- Spawns a Bony.
- While at least one Bony is still alive, the Forsaken becomes incorporeal and floats erratically around the room staying away from Isaac and very occasionally drifts towards Isaac attempting to pass through him.
- Every tear shot towards the Forsaken during this phase passes through it.
- When at around 30% HP it spawns 2 Bonies instead.
- When all Bonies are killed, The Forsaken moves close to the center of the room before reappearing and firing 3 Brimstone lasers in triangular directions with one laser always shooting in the opposite direction of Isaac. These lasers then rotate just over 180 degrees in either direction.
- Afterwards it stays vulnerable for a few moments before spawning another Bony and repeating the process.
- Unlike its counterparts The Haunt and The Heretic, The Forsaken does not deal contact damage while incorporeal. Rather, if Isaac walks through The Forsaken it spawns another Bony briefly becoming vulnerable while doing so.
- If this is repeated without killing any Bonies until there are 4 alive on-screen, the next time Isaac walks through The Forsaken it performs a modified version of its Brimstone attack with greatly increased speed and duration killing off all Bonies.
Champion Versions 
- ◼ Black: Spawns Black Bonies instead of regular Bonies. The Spinning Brimstone attack is replaced with The Forsaken spawning 4 Dank Death's Heads and resuming invincibility for 1 second if there are no other Dank Death's Heads alive. It can not spawn any Dank Death's Heads if there is at least 1 other alive and will instead remain vulnerable for a duration before spawning another Black Bony.
The Forsaken as one of Delirium's forms.
- It is the posthumous version of The Haunt.
- When The Forsaken disappears, it covers its eyesockets with its arm-like bones. This is most likely a reference to Boos from the Mario franchise.
- The Forsaken appears to be The Haunt without its ghostly exterior.
- During the versus screen, the Forsaken's Bony-spawning sound can be heard. The Forsaken is one of seven bosses that can be heard during the versus screen, the other six being The Stain, Big Horn, Mom, Mom's Heart (pre-Repentance), It Lives (pre-Repentance) and Mother.
- The Forsaken can be found in The Void, even before being unlocked.
- The Forsaken has an alternative resurrected variation known as the The Heretic.
|The Binding of Isaac: Rebirth|
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