XTC - ssraeshza temple

XTC seems to be confused. Twice in a row I've tried this mob and the exact same thing happens. She completely ignores my character (the tank) and kills the dps, then the healers and only turns to me after every bot is dead.

I'm pulling every trick I can think of, Blade of Carnage with anger aug, Bellow, spamming taunt. Nothing I can do will get XTC's attention until she's killed off all my bots. Then of course she turns and kills me.