| Floors of
| Base Health||520|
|Items Dropped||Boss Pool|
The Adversary is an enemy in The Binding of Isaac: Rebirth that is present as a Boss on The ??? Floor. It is the posthumous variant of Dark One.
During the battle, The Adversary will perform on of many attacks. The attacks The Adversary can perform are as follows:
- The Adversary will jump into the air, landing and creating a circular fissure around itself.
- The Adversary will split open, shooting out a few Spiders.
- The Adversary will shoot a homing brimstone-laser at Isaac.
- The Adversary will darken the room.
- In the game's files, The Adversary is referenced as Dark One 2.