I tried to dps him down with AW fignelia skill 4/5 and AW belinda, fignelia has the highest dps of all witches besides Despara and higher attack speed while stalling him with memento tokens, but he kills them so fast you barely regenerate the 5 up it takes to place the tokens. He made it through. I have to try to use bashira on the third ranged slot to dps him down, i dont have many high dps options.