I beat it with Thieftruvian. Had zen'rui, psyonic conduit, dominate will and mirage master, nothing more special. I used nimbus which caused the boss to freak out and attack the totems with everything it had, and that helped me to keep the board cleared.
Aymara healer saved the day for me, since it did 15 dmg to the general by attacking it twice .
Also, I used mirage master and zen'rui on one bonereaper to get 2 provokes.