Spirit Shackles

Spirit Shackles is a passive item added in The Binding of Isaac: Repentance.

Effects

 * Upon death, Isaac turns into a ghost that is linked to Isaac's dead body, similarly to, and can continue fighting with 1/2 of a heart. Isaac comes back to life 10 seconds after this effect occurs if he doesn't take damage while in ghost form.
 * Isaac has flight in ghost form, but no spectral tears unlike other ghostly forms.
 * After this effect occurs, Spirit Shackles cannot activate again until Isaac gains a half or full Soul Heart or a Black Heart. Soul Hearts that are used to charge Spirit Shackles will not be added to Isaac's health.

Interactions

 * //: Ignores Spirit Shackles and fully kills Isaac.
 * /Broken Ankh/: Soul hearts given on respawn cannot recharge Spirit Shackles.
 * : Spirit Shackles can activate for both characters. They can toggle between The Forgotten and The Soul as normal while it's active, and the form that didn't "die" will have their normal health. Toggling from The Forgotten to The Soul will also create another body of The Forgotten that The Soul will be chained to in addition to the original body.
 * : Soul charges cannot be used to recharge Spirit Shackles. Picking up soul hearts recharges it as normal.
 * /: The character that has Spirit Shackles must die for it to activate; if the other character dies, it will not activate. Only the character that has Spirit Shackles can recharge it.
 * In the case of Jacob and Esau, the brother that has Spirit Shackles will be chained to their dead body, while the one that doesn't can move freely. If either brother dies while Spirit Shackles is active, the other dies with them as normal.
 * /: Cannot be recharged by picking up soul hearts, as they are turned into blue flies while playing as them. Effects that would add soul hearts to health directly, however, can recharge it.
 * : The ghost will spawn from Tainted Forgotten instead of Tainted Soul; it will be invulnerable, unable to move, and use the bone club instead of Tainted Forgotten. It can also be thrown, but will rapidly return to Tainted Forgotten due to being chained to them. Tainted Soul is unaffected, and can take damage as normal.
 * : Dark Esau will not activate Spirit Shackles if Tainted Jacob isn't already in his "lost" state. If he is, Spirit Shackles acts normally.
 * If Tainted Jacob's body is still in the room, Spirit Shackles will chain him to it when it activates.
 * If Dark Esau touches Tainted Jacob or dies while Spirit Shackles is activated, he will enter his "lost" state and drop an extra body. When Spirit Shackles' effect ends, he will return to life where Dark Esau turned him into his "lost" state and be chained to the original body until he leaves the room or the run is exited and resumed.

Synergies

 * : Effectively acts as a rechargeable extra life, granting additional defensive measures on top of his inherent and granting a use to normally useless Soul Hearts.