HAHAHAHA!!!
Me brothers of dark are tough foes hehehe..
oups sorry
Well a trick is to hit them and hit them hard, take out one at a time, start with cloudkill over the area you are to fight them in (takes care of the regenerating thingie..) Hit them with arrows of biting/fire/frost, have weapons of at least a +3 capability and also with some extra different damage types will do good. make sure to hasten your fighter, the key is to pound on as hard and as fast as possible to kill them before the regeneration kicks in...
So Bahamuts way, overkill is the way..
Or disintegrate
(Only wished the wolves and wolverines in Norway was this tough to kill!!!)
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WOLF WINS EVERY FIGHT BUT ONE, AND IN THAT ONE, HE DIES