I've included a sample below, but the real treat is the Avatar of Yog Sutekhis.
43. Crypt with Demon: The passage goes 10 feet into another chamber, some 30 feet to a side, with an archway in the centre of the right wall. The walls are composed of triangular burial niches, some filled with piles of bones separated by type – you can see niches that contain only jawbones, or shinbones, or ulnas, for example – but many seem empty. The ceiling is about 10 feet high.
Two monkey demons hide within the niches, one behind several skulls in a niche on the east wall, and one in an otherwise empty niche on the north wall (which cannot be seen into from the doorway). A 2 in 6 chance notices the first, but the second cannot be noticed until the room is entered (1 in 6 chance) and may well have a chance to act with surprise. Monkey demons look like red-skinned black-furred monkeys with wizened, evil, almost-human faces. Anyone bit by a monkey demon must make a save vs. poison (Will DC 10) or permanently lose 1d4 points of Strength.
Monkey Demons (2): AL C, MV 90’ (30’), AC 3 (17), HD 1, hp 5, 8, #AT 1 (bite), DG 1d4 + Strength loss, SV T3 (Fort +2, Ref +5, Will +2), ML 8, XP 16.
There are 300 niches in this room, but only about a third contain bones. Searching them takes a single character 30 minutes, and uncovers a leather bag containing 250 polished bone discs with crude faces scratched on one side of each disc. These are “money” of the Boneknapper’s Guild on Level Three, and can be used to barter with any ghouls met in this dungeon.