The Legend of the Tomb of Horrors
Lost into memory and legend drifts a pocket dimension, a labyrinthine crypt filled with terrible traps and not a few strong and ferocious monsters to slay the unwary. Rich treasures both precious and magical fill the crypt, but in addition to the aforementioned guardians, some say a demilich still wards his final haunt. (Be warned that tales told have it that this being possesses powers that make him nearly undefeatable!) Accounts relate that adventurers have an extremely low probability of ever finding the chamber where the demilich Acererak lingers, for the passages and rooms of the tomb are fraught with terrible traps, poison gases, and magical protections. Furthermore, the demilich has hidden his lair so well, that even those who avoid the pitfalls likely will not locate their true goal. So only large and well-prepared parties of the bravest and strongest should even consider the attempt, and if they do locate the tomb, they must be prepared to fail. Any expedition must be composed of characters of high level and varied class. They must have magical protections and weapons, and they should equip themselves with every sort of device possible to ensure their survival.