Twilight Calling (Dungeons and Dragons module M3)

Alphaks the Dark desires that key, by which he plans to release death and chaos into the realms of man. Your party may be all that stands between life and death. Will you heed the lunatic ravings of a dying madman? Travel to the top of Guardian Mesa, and enter the Septahenge. Gather the mystic symbols, create the key, and defeat the Carnifex, before it's too late.