It took me three tries, but I finally did it. The first time I ran out of Spell Points at the time the traps were spinning around, so I decided to Dimension Door back to the shrine to top off. Oops!! The second time I watched my Spell Points even better and kited Suulo around for an hour or two necroblasting him as we ran in circles. Note for Pale Masters. Necroobolt didn't affect him but Necroblast did. At the end when every thing popped out, I died. The third time I started by kiting him around until the Barbazu's emerged. At that point I used Mass Suggestion and let them fight it out. Of course, I was really bored by this time and chugged some SP pots and blasted away at him just to get it over with. I chugged a few more at the end fight just in case so I wouldn't have to start it all over again. I ended up using the spell points, but I was definitely over-healing myself.
Here are my little minions fighting Suulo.
Here they are after they kicked Suulo's tail!
Btw, I really enjoyed this pic where they teleported up to his perch and fought him there.