Use an AOE burner like Mordechai or Akoth for the boss.  Then control + support for the waves.  Only gotta do it once so slow and steady is fine. 

Used an AoE Burner with lots of support:  Dec Atk, Ally Protection, Healing & Revive. Worked first time, now back to farming for the Fusion.    

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My team was Yuzan, Stag Knight, Fenax, Doompriest and Aniri. 2 damage dealers and 3 healers. Got 'er done in one try.

Fenax block reviving the adds comes in so handy. 

I see you still have that bro-crush working.