Skull Cavern - Stardew Valley Wiki

The Skull Cavern is located in the northwest area of the Desert. It is initially locked and requires the Skull Key to gain access.

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found this on floor 880 though it was an enemy from sve but it doesnt show on neither the official wiki or the sve wiki, i think its a lava bat, but

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10000 floors in the Skull Caverns within one day