The remote island settlement of Talmandors Bounty is thrown into chaos as a strange magical effect plunges the region into shadow. Urged to investigate the event, the PCs travel to a nearby island and discover an ancient Azlanti prison that was buried during Earthfall. Inside, a cult of the blood god Camazotz thrives, and in dealing with them the PCs learn that greater threats lay deeper inside the ancient complex. Can the PCs discover whos behind the supernatural shadow and stop them before its too late? Thirst for Blood is a Pathfinder Adventure for four 1st-level characters. This adventure begins the Shades of Blood Adventure Path, a three-part monthly campaign in which a group of adventurers explore a ruined ancient prison to stop a vampiric threat to cover the skies in shadow.