i've found the ai of the spider bosses is broken, becouse when you engage a fight, they run into the ground or even into the wall.
this happend to me in:
- stonefalls / crow's wood (may be already fixed with the last patch)
- stormhaven / spider nest (just yesterday)
another consideration outside this post is that most of the bosses is realy easy to kill, but one i'm not be able to complete (sure i miss to use some strategy), is the atronach boss in ancient altar (i'm levelling bow, to see if with the snipe i can do something).
Nord, sorcerer, R3