Tides of Terror
Mitchell Miles is a man whose mind was destroyed by taint. As a child, he murdered his family and was taken to a school of learning to go under the care of Dr. Seth Lambent. Mitchell never spoke after he became depraved, and bid his time, until years later when he returned to his hometown of Seawell.
He arrived and began a murder spree. He killed many people, but was eventually defeated by the party. They subdued him and sent him to a temple so that he could be transported to where he was to be executed.
Dr. Lambent looked to transport him the next morning, but Mitchell apparently escaped.