Originally posted by kibbostrom:

Alternately, did the Stagbreaker not have an Area Of Effect attack?
You could try using one a few times and see if the Draugr is affected. Just be prepared with good food and some healing available should you have to retire fast.

^this^
I find stagbreaker to be super useful in dungeons. It is very effective against skellies in burial chambers and bats in frost caves... and you can use it to kill blobs and draugrs on the other side of mud piles in sunken crypts.