D&D 5E (2014) The Werewolf of Legend

[MechaTarrasque]

I would borrow a few things from the barghest, which is really just the fiend version of a werewolf. Start with advantage against magic and magic effects. Then add a few spells: blink and levitate as at will, dimension door 3 times a day, and dominate monster once a day. Then from 4th ed, psychic howl (fear from howling) as an action (3/day) and life feed (adds necrotic damage to bite attack). These make a pretty rugged and mobile enemy.

 

[Minigiant]

I added a quick draft of an idea of how I see the legendary werewolf.

http://www.enworld.org/forum/5emonsters/showentry.php?e=91

Although a greater werewolf would not be bad as well.