Forsaken Sepulcher

From publisher blurb: This dungeon is designed for 3-5 players of at least level 10. The Party, for one reason or another, have come to this pyramid-shaped dungeon in the middle of a vast desert. They must traverse the three floors, filled with traps and monsters, in order to reap the rewards: treasure & glory rumored by those aware of the dungeon, as well as a mysterious drive to continue pushing in. This drive, of course, is caused by Inursys, an eldritch being of vast power from the edges of creation. The true purpose of having adventurers come to this place is for Inursys to find adventurers strong enough to imbue with its will so they can escape this place, where it has been imprisoned for thousands of years. At the end of the dungeon, The Party will encounter Inursys, who will tempt them to join it. Those who are able to resist its thrall will be able to fight against it and if they are successful, they will be able to sever the ties Inursys has to the Mortal Plane and obtain some powerful relics by doing so.