The Ruins of Thoring Keep

From publisher blurb: The hill-fort of Thoring Keep was beaten to rubble a generation ago, when its commander was found to be worshiping dark gods in their subterranean chapel complex. Locals were recently horrified when a pair of spiny creatures, skittering and horrific, were spotted near the ruins. Soon after, campfires were spotted among the remnant walls. The local reeve has called for a party to investigate the occurrences, and find out who or what has been skulking around the old fort...