... for when you gaze long into the abyss. The abyss gazes also into you.
The Tomb Of Horrors
The ultimate Dungeons & Dragons challenge (as featured in Ready Player One)
Somewhere under a lost, and lonely hill of grim and foreboding aspect lies a Labrinthine crypt. It is filled with terrible traps and not a few strange and fercious monsters to slay the unwary. It is filled with rich treasures both percious and magical,but in addition to the aforementioned guardians there is said to be a demi-lich who still wards his final haunt. Accounts relate that it is quite unlikely that any adventure will ever find the chamber where the demi-lich Acererak lingers, for the passages and rooms of the Tomb are fraught with terrible traps,poison gases, and magical protection. Futhermore the demi-lich has so well hidden his lair that even those who avoid the pit traps will not be likely to locate their true goal.....
In the words of Gary Gygax himself
"There were several very expert players in my campaign, and this was meant as yet another challenge to their skill—and the persistence of their theretofore-invincible characters. Specifically, I had in mind foiling Rob Kuntz's PC, Robilar, and Ernie Gygax's PC, Tenser."