Make sure that your cure noxious, minor healing and minor arch healing are at least Apprentice II, and preferably III.
Then, when you get into the threshing room, stand in the middle of the circle of candles and keep healing/curing yourself while the statues smite and poison you. Do not attack them at all.
Eventually they will stop glowing, Modinite Z'Vol will appear in the room and say 'Impressive', talk to him to advance to cleric.
Edited, Sun Dec 19 12:49:14 2004 by DaveOfDiabolos