High Plains Cavern is a cavern in The 99 Caverns and was featured in "It Comes by Night".
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Similar to Deadweed, Dark Spores and the Dark Periphery, this cavern is a quiet dark and eerie place, and with a huge population of slugs, High Plains would become the target of one of the Darkbane Monsters, an Eel, which would use the cavern as its hideout and regenerate in secret, while also terrorizing the cavern's residents, and go onto be known as "The High Plains' Monster", being named after the cavern.