Missing Poster

Effects

(Removed in Afterbirth) If Isaac dies to a (Sacrifice Room) Sacrifice Room's spikes, a puzzle piece will appear on his last will.
(Added in Afterbirth) Dying in a (Sacrifice Room) Sacrifice Room while holding it unlocks (The Lost) The Lost. If The Lost is already unlocked, it instead revives Isaac as The Lost on death, then disappears.

(Removed in Repentance) None of the effects will occur during any Challenges.
(Added in Afterbirth / Removed in Repentance) Resurrection items activate in a set order. Missing Poster has the lowest priority of all / (Added in Repentance) the second lowest priority of all, with only (Tainted Lost) Tainted Lost's (Birthright) Birthright effect being lower.
(Added in Afterbirth) Also works while (The Lost) The Lost is the one carrying it.
(Added in Repentance) Missing Poster counts as an extra life for (Tainted Lost) Tainted Lost, rather than respawning him as his non-tainted counterpart.
(Added in Afterbirth / Removed in Repentance) The Lost will not carry (Holy Mantle) Holy Mantle when revived into this way.
(Added in Repentance) The Lost will carry (Holy Mantle) Holy Mantle when revived into this way.
If Isaac teleports out of the (Sacrifice Room) Sacrifice Room before dying, The Lost will not be unlocked.

(Added in Afterbirth †) Gulp! / (Added in Afterbirth †)(Marbles) Marbles / (Added in Afterbirth †)(Smelter) Smelter: Missing Poster functions correctly after being consumed, but still disappears after activating.
(Added in Repentance) (Tainted Lost) Tainted Lost: Revived as Tainted Lost instead of The Lost.

(Added in Repentance)(Birthright) Birthright: (The Lost) The Lost's Birthright effect will apply after respawning as him, even if Birthright was obtained prior to dying.