Binding of Isaac: Rebirth Wiki
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(in Repentance)
Questionmarkisaac For the trinket with a similar name, see Found Soul. For another trinket with a similar name, see Your Soul.

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

Effects[ | ]

Notes[ | ]

  • Lost Soul hides behind Isaac's back, so shooting left will cause Lost Soul to be on your right side and vice versa.
    • Also, if Isaac is moving right but shooting left, then his hitbox will completely absorb lost souls hitbox, making it significantly harder for enemies to hit it.
  • Floors completed during the Ascent count.
  • Waiting until after the floor is cleared before picking up Lost Soul nearly guarantees a reward payout on the next floor.
  • The ghost can take explosive damage from Isaac, e.g. via placing a BombBomb.
  • Lost Soul's position behind Isaac can overlap with other Familiars.
  • Leaving the Mother's ShadowMother's Shadow chase sequence respawns Lost Soul.
  • Swapping the item as Character Tainted Isaac iconTainted Isaac and picking it up again respawns Lost Soul.
  • Spiked Rocks will kill Lost Soul.
  • Lost Soul can die if it touches projectiles generated by friendly enemies (spawned from Collectible Mystery Egg iconMystery Egg, for example).

Synergies[ | ]

  • Collectible BFFS! iconBFFS!: Gives Lost Soul a once-per-room shield, similar to Collectible Holy Mantle iconHoly Mantle.
    • If BFFS! is dropped, the shield will still remain active until taking one hit of damage, acting similarly to Holy CardHoly Card.
  • Collectible Forget Me Now iconForget Me Now/Collectible R Key iconR Key: Restarting a floor/run causes Lost Soul to give a reward if it's alive when used.

Interactions[ | ]

In-game footage[ | ]

Trivia[ | ]

  • Lost Soul originates from the Antibirth mod. In Antibirth, multiple copies of the item would grant multiple familiars.

Bugs[ | ]

Bug Bug! If Lost Soul is killed before the segment with Mother's Shadow, it will respawn after Isaac returns to the normal floor.
Bug Bug! Lost Soul can die if it touches projectiles generated by friendly enemies (spawned from Collectible Mystery Egg iconMystery Egg, for example).
Bug Bug! Swapping Lost Soul for another item as Character Tainted Isaac iconTainted Isaac and picking it back up again will cause it to respawn if it died previously. This can also be accomplished with Butter!Butter!.


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