Player2 on 28 May 2020
I had no problems beating the level 120 boss with a Shulk/Reyn/Sharla party before sunlight kills them. I don't remember the exact setup, but I used chains for big damage, using mainly red arts (Sharla's head shot might be mandatory) and Monado Buster to change the color of the chain without losing the damage bonus.
Dunban was in my party in all the previous high level bosses, but swapped him with Reyn for the extra chain attack chance.
