But I had to bug it to win. I killed the two caster adds in the back, which puts you in combat but doesnt aggro anything. Then I AoE'd the xuatips till they ran to me but the boss doesn't move. Once all the adds were dead i summoned a single mob to trigger the Dragon's aoe stomp? i dunno it apparently ignores armor, then followed it up with more summons to eat the breath. Finally I could send my characters in and buffed up my tanks with every cleric spell possible. I summoned more guys using my chanter and had my druid just spam Raw spells on him as i watched my tanks get 2 shot through every buff. He turned to the summons instead of my characters and finally was able to whittle him down with grazes. He died.
Summary: This boss is TOTAL BULLONEY. Imagine Firkragg with undisspellable Stoneskin, surrounded by Dire Charm spamming adds, one shotting anything he looks at, and if you aren't in melee range he drops a nuke.