ok this has been tested by me and im a lvl 12 mage.

1. Make sure your lvl 10 then go get 1 pvp trophy. Once you have it buy unsqeakable Farce
(smells oddly like bacon:P)
2. Go to warloc and start the summoning.
3. heal if u need to on the prompt before the start then get ready. as soon as you start
   hit him with all tht you have!! dont use any other spells just normal hit him.
(considering he has EXTREMELY high defence for EVERYTHING)
4. sooner or later u should get to about 50HP or less. use your potion #1. then blind
hi,and keep attacking. BY this point in a couple of hits he should be dead!!!! well done. 
:P

P.S. i hit 121 on him (lucky me >:] )