I had a lot of fun with the end and I'm not a challenge whore. Max firebreath, and fireball were the only skills I needed. Well, summoning a Wryven probably helped decoy things a little too. Also, the patriarch nuke spell was extremely satisfying. I didn't even know I had the spell at first. The fireball doesn't recharge fast enough, so you really have to rely on the breathing to get 80% of the work down. (less if you make smart use of the patriarch nukes). I could definitely see problems if I didn't go in with max firebreath. That skill is the workhorse, and I'm not sure how I would beat it without that skill.