Whats an easy way to get past the umber hulks?? i tried fighting but i got slaughtered! HELP

i have found that the easiest way to kill the umber hulks is to send a charater in the room (either inviseble or or a theif in stealth mode)a let him/her have a look around........the get the charater out and have Nalia cast Cloud kill in to the room.......easy and quick.......but be carefull some times one of the umber hulks is out of range for the spell.......but it shoudnt be any problem for you to take one out

Or you send in your hidden character with the dog stew and put it with the bones. Sneak out again. The hulks will go and eat the stew. You can then kill them where they end up, leave them there or lock them in.