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Fiend FolioThe Devil's Harvest"Genetically modified revive"Passive item
+1 Extra Life.

Upon dying, Isaac will respawn as Fiend in the previous room, with 2 Black Hearts and 1 Immoral Heart.

If playing as Tainted Fiend, it will revive as that character instead, with only 2 Black Hearts.
Unlock: Defeat Mother as Fiend.
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