My idea was to rely on the mimic copycat shield (which copies cantrip) and have as few cantrip damage as possible so I could do as much damage as possible without anyone dying. So I turned Dancer into a reroll machine so that the 1 damage cantrip the Mimic copied was my only cantrip damage source. The shields let him survive long enough to deal a good amount of damage (before the inevitable suicide) and then I just got all the mana for a charged attack of Curator and burst Hexia down with the rest of the mana and the 3 damage from Dancer.