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A terrain card found within the Lion God Expansion.
Card Text
Survivors may not voluntarily pass through the Sinkhole. If a survivor ends their movement on a Sinkhole, they fall into the darkness and are dead! If a terrain tile would occupy any spaces occupied by the Sinkhole, it falls in and is archived.
: Plunge into the depths.
Gain 1 survival and 
Necropolis.
Use once per survivor per showdown, only if fighting the Lion God and if another survivor is adjacent to the Sinkhole.
Setup
Set up adjacent to the monster.