The Last Dark Priest of Surog

From publisher blurb:

Dungeon Depths 5: Last Dark Priest of Surog is a stand-alone and generic fantasy RPG adventure complete with maps, room descriptions, NPCs, and general information for a GM to run it using any fantasy RPG game. The adventure is rules-agnostic, meaning it will require some customization by the GM with regards to NPC and creature stats.

Surog, a god of decay, is attempting to return to the world of the living. His last servant, Vorrak the Whisperer, has begun a ritual that will see plagues spread across the lands unless the ritual can be stopped.