The Crystal eye is a giant crystal hidden deep within the Dungeon; its only appearance is likewise in "Dungeon." The crystal eye serves to cover a hole containing Demonic Eye Creatures. It is unknown whether the crystal eye has any real value.


It looks nothing like an eye; it resembles a huge, faceted blue gem. The crystal eye is of immense weight, consistent with its size, requiring both Finn and Jake to lift it simultaneously.



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