Room 81: Empty
Room 82: 6 Giant rats, 900 CP in bags, protected by contact poison. The rats are immune to the poison. (When I rework all the monsters with variable abilities using the Lee Gold method, this will be one of the possibilities for giant rats).
Room 83: Empty
Room 84: Empty
Room 85: Empty
Room 86: Empty
Room 87: 1 Adept (knows Read Magic), wearing Leather Armor +1. Whether this person was once a prisoner or a looter, their history is now lost to time. They now stalk the Prison recording the tales of the prisoners.
Room 88: 1 Seer (knows Protection from Evil and Light), no treasure. A supplicant who fancies themself the high priest of the Nether Prison.
Room 89: Empty
Room 90: Empty