While traversing toxic wasteland near the Rift, Lady Devaedra stumbled upon the giant, twisting form of Grenn. Impressed by the power that he could feel emanating from her, Grenn listened as Lady Devaedra presented him with an offer: use his strength to help her reach her goals, and in return she would feed him the power that he desired. Grenn agreed, believing it to be the choice that would benefit him the most.
Though the fallen enemies of House Devaedra feed his power, Grenn, like Lady Devaedra herself, is never satisfied with what he has. If he one day found that it suited his needs, he would feel no qualms about turning on House Devaedra and attempting to devour its immortal leader. However, Lady Devaedra is no fool; she knows better than to mistake a mutually beneficial relationship for true loyalty.