first I am confirming that mist Howler is on a 12 to 24 hour spawn time and that it has three places it spawnes, all lining the path between the north entrance to Ashenval from Dark Shore to the Zoram Strand. Mist Howler does not start with it's Terrifying Howl ability (fear) it only starts with the buff furious Howl (increases the damage done by all party members during their next melee atack with in ten yards). Mist Howler is best tamed by setting a freezing trap then begining taming it, the reason for this recomended strategy is becuase you have a very high chance of being feared.

Happy Hunting