Daenyr's Return (5E)

From publisher blurb: 4-6 Characters of Levels 8-9 3,500 years have passed since the vampire Daenyr and his followers terrorized the countryside from his dark temple. His name now myth, his temple in ruins save for a few remaining chambers; no one recalls how or why this came to be. A mysterious cult has taken up residence in the ruins, and rumors of blood rituals and a crimson god are spreading across the countryside, while many disappearances go unanswered.