The Soul is a secret unlockable item in Rebirth.
- Adds 2 Soul Hearts.
- Isaac gains a blue aura that can repel enemies and enemies projectiles.
- The strength of the aura can vary from stopping a projectile far away from Isaac from just slowing it down. The aura's strength can be measured by the intensity of the aura.
- Ground enemies will overcome the force more easily than flying foes or projectiles.