Spider Cave is a location in The Precursor Legacy. It is a vast crater located deep below ground level: below the initial level of the under-ground Volcanic Crater. It is littered with hazardous dark eco pools, Precursor artifacts, wooden rigs, and old Precursor structures. The dirt cave is supported in some areas by wooden beams, which had been partly compromised by gnawing lurkers. Other lurkers, under the direction of Gol Acheron and Maia Acheron, invaded the cave in a mission to excavate a Precursor robot from the cave's center. It is indigenously inhabited by spiders.