Revelation - Put Dark Sacrifice into play in your threat area if there is no copy of it in your threat area (if there is, discard Dark Sacrifice and it gains surge instead).

Forced - After strength is added to the abyss: Take 1 damage and 1 horror. If this effect defeats an Ally asset or investigator, that card is "taken by the abyss."

After strength is removed from the abyss: Discard Dark Sacrifice.