Lost Soul

Lost Soul is a passive item added in The Binding of Isaac: Repentance.

Effects

 * Gives Isaac a small soul familiar that closely follows behind him. If the soul takes damage, it dies, respawning at the start of the next floor.
 * If the soul survives to the start of the next floor, it spawns one of the following:
 * 3 soul hearts.
 * 2 eternal hearts.
 * An item from the Treasure Room or Angel Room item pool.

Synergies

 * : Gives the Lost Soul.
 * : Restarting a floor triggers the Lost Soul if it is alive.
 * : Swapping Lost Soul for another item and picking it back up again will cause it to respawn if it died previously.

Interactions

 * Does not provide immunity to contact damage from spiders to the Lost Soul.