A Mysterious Voice is heard while inspecting the unstable altar in the cave west of Mount Quidamortem that is visited during the Tale of the Righteous quest. It shouts "Rickard! Turn away! Don't do this!". It is never seen during the quest.
While the identity of the mysterious voice is not known, It is known that the person the voice mentions, Rickard, could not have been part of the expedition to Mount Quidamortem, as the members of the expedition were Magnus Rimor, Bev Crushim, Thomas Berlin, Henno Garvie, Rytin Edshirt and Keith Jones.