Soloing Mandokir ("raptor boss") as a mage is done in a very traditional mage vs warrior fashion: Kite him to death.
I got the idea one day and the next day he was dead. There weren't many surprises at all.
I'll have to apologize for it taking unnecessarily long but I was being extra careful seeing as it was my first kill. I could speed the video up more but then it would get really hard to see what happens sometimes. Anyway, I hope you'll like it. =)
Want to do it yourself? Guide at http://raptor.enquillion.com.