Queen of the Demonweb Pits is a Dungeons and Dragons™ module published in 1980 by TSR. It is considered as the conclusion of a series of seven AD&D modules, and may be played alone or as a climax to the "Giant" series (G1-2-3) or the "Drow" series (D1-2 and D-3) campaigns. It is suggested that characters of levels 10-13 play, as ones of a lower experience level would most probably be obliterated by the monsters. This is, after all, a module set in a different plane where you'll end up fighting Lolth, Drow queen of the spiders!
I don't know about you, but I wouldn't go sacrificing my level 6 mage to some hellish dark elf queen...
P.S: More information might come, if it can be wrung from the mind of a local AD&D connoisseur....