The bad thing about the kael fight was it took like 20 minutes to kill, and the first 4 minutes was just killing the easy advisors one at a time. So when you were learning the actual Kael phase of the fight which starts like 10 minutes into the fight you would have a long time inbetween good tries. And the trash was horrible and corpse runs took ages. But in a lot of ways, it was a good boss.