Maún was an Umaia of old.He eventually appeared in Dol Guldur and became a servant of the Necromancer.While not the most powerful Demon, he still was a skilled Sorcerer and served his Master as an Agent and Spy.As a shapeshifter, he could appear in mannish-form or as a large Werewolf.After Radagast the Brown had left Rhosgobel to go on his neverending Journey, Maún briefly impersonated the old Wizard, trying to infiltrate the White Council.
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A false Radagast who actually is a Werewolf appears in one possible plot- twist of Interplay's the Lord of the Rings - Game I.The creature's true name is not revealed in the game, it is just called "Radagast".