In the game, he was first seen with Sareth in an old Shantiri Temple. He instructed Sareth to obtain the Shantiri Crystal, and in order to do that, obtain a Spider Key. His voice guided Sareth through the temple. Home, Master Phenrig told Sareth to go to the city of Stonehelm to find the wizard Lord Menelag and deliver him the crystal, and, if he accepts, to go with him on the trip to the Island of the Spider to retrieve the Skull of Shadows. To aid Sareth on his adventure, he summoned Xana and bound her to him.
Phenrig appears in a vision of Sareth at one point. It is like a memory. Phenrig tells Sareth about his following adventure, but using different words. Frequently, Sareth sees a strange red light. When Phenrig summons Xana, Sareth realizes at a point that Xana was a succubus.
Phenrig appeared in Dark Messiah of Might and Magic.