This boss fight can be really hard or really easy.
There are 3 ways i came at this.
1) I got a regeneration potion and a health potion and ran around the out side of the room running backwards stabbing.
(Kitting) easy
2) I ran out of the room you spawned in and used the golems i found around the map and let them run in and kill
everything and i just finished off the ones that ran past the line of guards i made. (not cheating) 
(Guards) Medium
3) I ran in and just stabbed.
(Died) Bad...