The Cat Lord's realm, known as the Cat Lord's Prowl, is in Brux, the second layer of the Beastlands.
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In the adventure Something Wild, the Deliverers, a group of hunters from the plane of Carceri led by a wizard called Garond the Claw, captured the Cat Lord and brought him back to their home plane.
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He is allied with various animal lords of the Beastlands, beings whose ranks include the Cat Lord and the Wolf Lord, though it is not clear if he is allied with those lords specifically.