The Moldos' Secret Lair is a small cave hidden behind a bookshelf in the library. It is the Moldos' hideout in "Paper Pete." It appears to be underground or in a rock wall since its walls are solid rock. On the purple walls of the lair grow luminescent purple, blue, and pink crystals, which some Moldos pop out from behind when Finn enters the lair.
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Finn in the lair