someone deleted my other post hehe
well, my furnace is only 6%, i used epiphany+blinding flash dmg capture mostly to burn down the final hp's, i think i used fof, ep: flesh is weak, epi, blinding flash, retribution, and fire ally, then unity, combostrike, fleet and beacon i think.
gearwise i used tyrael, shoulder aughild, bracer fire aughild, rorg, fire soj, belt/pants blackthorn, firewalkers, my mara didnt roll too great, glove/helm cains. if i had a good witching hour i might have used that but i mean couple seconds here and there is ok, i had a 3-4 second remake time. sss might be a good cohice to replace fireally tbh, the idea behind my build was to pop epi after the 2nd flash and burn him before epi ended, but you would need 50% cdr still - otherwise dont flash+epi till >5 seconds in
my fireally would kill him on or just after the 2nd cast so i dont know if that helped either but i think sss might be better since dmg % throughout the fight imo doesnt matter too much, just the burst near the end. hope this might give you some ideas, a fire andys would be a nice choice, then you might use cains gloves/pants and blackthorn belt/boots, but if you had a good witching hour i think i might try that too.