600/Smite Kathandrax Problem..

@Level3 of the Kathandrax dun, after spawning the Flame Djin to get the boss key, I fight him for a while, but eventually, I start to run low on energy & can't upkeep SB & PS, or his dmg is just to great and kills me with my enchs up...has anyone any adivse on how to kill it?

Would be much appreciated.
Thanks.

you have to use pain inverter on him and drag him back to your whole group. have everyone stand in the same spot and let pain inverter do it's job.