Firkraag is a wuss, and so is Kangaxx.
All you have to do is find the right strategy to kill the suns of beaches.
Kangaxx is obvious, kill the Lich-form with traps, and get the Demi-Lich-form by standing your mage directly next to him with Spell Immunity: Abjuration. Then slash him to death with some summoned creatures (fighting doesn't require to stand directly next to your target, heh heh, and since the wimp has the worthless habit of always throwing his Imprisons at the nearest NPC, your mage will be totally unaffected, all you have to do is recast the Immunity once in a while).
Now for Firkraag. He can be put on ice without even being damaged. To do so, try this strategy: three words:
Wand, of, Cloudkill.
Get one, sell it and buy it again, so it will have 50 charges.
Stand your mage just out of the dragon's eye sight, then blast a couple of times with your wand in his directory. If you have aimed right, you'll see he gets damage. The only prblem is his Heal ability. Just throw enough charges so one of the clouds will become fatal (it took me 15 charges).
Aerie's most powerful vanquished: Firkraag. Yee-haw! And it was "cake"!
"Just gotta find the right spot."
"Wand of Cloudkill covers all spots
http://www.gamebanshee.com/ubb/wink.gif"
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-Amen