Shadows of Apep

From publisher blurb:

Centuries ago, in the scorched desert of Niserri, an evil high priest was defeated before he could finish a powerful ritual designed to free his dark god into the world. When the mummified remains of this priest are reawakened as a powerful undead monster it's falls upon the heroes to stop him from finishing the ritual he started so long ago. Failure means letting the entire world fall into an eternity of chaos and darkness.

This is the first in a series of adventures made for the Mythic campaign setting. It can be played as a stand-alone adventure or inserted into a long running campaign.