

Furthermore, if the Book of Revelations is used on the first floor of a Chapter with a Double Trouble room no Harbinger will spawn on the second floor, even if Book of Revelations is used again.


The Headless Horseman on any floor in Chapters 1-4.Death or Conquest (if unlocked) in Chapter 4, floor 1.If the Book of Revelations is used at least once in a floor, a Harbinger will replace the current floor's boss (all other Boss generation rules are still respected):.Increases chance for a Devil Room or Angel Room door to open by 17.5% ( 35%) if held while killing the final Boss of the floor.
