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This item can replace the Boss even after Isaac initiates a battle with a normal boss and then teleports out before the fight is completed.
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Death or Conquest (if unlocked) in Chapter 4, floor 1.The Harbingers capable of appearing, and the floors they appear on, are as follows: Collecting three items from this set will transform Isaac into Bookworm. This item belongs to the Bookworm set.This has a high chance to happen but is not guaranteed.This will always happen as long as the floor's respective Harbinger has not been encountered, the boss has not been fought yet, and a Harbinger can appear on the floor normally.If the Book of Revelations is used at least once on a floor, a Harbinger will replace the current floor's boss if possible.Increases chance for a Devil Room or Angel Room door to open if held while killing the final boss of the floor.
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