“Steve: Most of the opening paragraph is a warning about difficulty. ‘You’ll never find the demi-lich’s secret chamber’ and the tomb is fraught with “terrible traps, poison gases, and magical protections.” It’s telling you not to play the adventure.
Zack: Not just in that part. In the DM’s notes section at the start, Gygax explicitly warns Dungeon Masters that if your players enjoy killing monsters they will be unhappy with the adventure.
Steve: ‘This module is only for parties that enjoy dying immediately and repeatedly.’ Oh, man, we’re not going to play though this thing are we?”