???'s Soul is an unlockable trinket.
- Spawns a familiar that floats slowly around the room on a zig-zag pattern similar to The Peeper and fires spectral and homing tears that deal 3.5 damage.
- The familiar shoots once per second.
- The familiar shoots once every 2/3rds of a second.
- Unlike The Peeper, ???'s Soul does no contact damage.
- ???'s Soul is unable to shoot while flying over obstacles (which is the same behavior that Ghost Baby has).
The ???'s Soul familiar in-game.
The ???'s Soul familiar in-game compared to Isaac.