You hear a skittering noise behind you, and whip the lantern around in terror. There it stands in front of you, in all its horror — a writhing serpent of chitin and legs, looping over itself endlessly in a shifting dance. Your eyes drift up to find its head, but all you can see are two piercing white eyes. The Horror of Shelf 17-North-by-West, the Protector of Knowledge, the Eighth Archivist — you've stumbled right into…

The Rounderpedes Nest.