Note: This information was taken from TSR's original AD&D adventure, the Temple of Elemental Evil.
For the players: The walls of this 20' x 40' room are frescoed. Two suits of plate armor hang from each long wall, north and south; each is of black metal, enameled with strange glyphs in pigments of red, white, green, and brown, surrounding a golden skull. The armor is strangely fluted and spiked; the helmets are wrought to give the wearer a most frightening appearance. Each of the four suits of armor also bears a huge two-handed sword.

For the DM: These four suits of animated armor guard this room, attacking all those who enter. They are immune to all magic, but can be struck by any sort of weapon. They fight mindlessly, until destroyed, to prevent intruders from remaining in or passing through the chamber. They will not enter area 344, but will pursue intruders down the west passageway and all other rooms (areas 346-353) except 340. The golden skull inlaid on each suit of armor is actual gold, worth 50 gp. Four topaz gems are also inset in each suit (each gem worth 500 gp).

Suits of Armor (4): AC 3, MV 6", HD 9,
hp 45 each, #AT 1, D 1-10 (two-handed sword),
SD immune to all magic, damaged only by blows (any weapons);
XP 2140 each (x4)

For the players: The frescoes show crowned and robed humans, attended by demons of minor sorts, and slaves bearing rich rewards parading in triumph before a horrible bloated figure upon a throne-like seat. The mottled fungous body-sphere of this creature is topped by a toadstool-like growth with a face upon it. The body has four elephantine legs, but no visible arms. Seated beside this abomination is an obese male demonic figure (a cambion, in all probability), also seated on a throne.