Avakuss enters the cavern and sees that there is indeed a sort of prison cell that's been built here. Behind the bars there are three sets of wall-mounted manacles in the cell, one of which is occupied. There's a closed metal door to the cell.

Chained to the wall is a swarthy and completely hairless man. The bald man appears human, and is wearing only a pair of tan pants. Seeing Avakuss, he hesitates, then resumes his screeching. "Eee! Eee!"

Also in the cell is a 3' long rat. It looks thin enough to be able to pass between the far end of the bars and the wall, so as to leave the cell. The dire rat hisses at Avakuss.

Spoiler: Ash
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Mindsight reveals that the man is a Humanoid with an Intelligence of 12, and the rat is an Animal with an Intelligence of 1.