I don't know about you all. But I have had super good luck with an ARC witch, Multen shell, displine, I also use -light curse, forgot name lol! But good lord it can do dom runs in 7 mins no problems. Lvl 72 maps 99% time easy. 7k arc,8k multen
3k life 3k engery sheild seems to be the sweet spot with 45% mana sheild regain faster added. Have pots set to 80% life 20% mana You do need a 6link armor to get mana,life,penatrate,Arc,Echo,Faster Cast Seems to rock. I used Fire penatrate,Reduce mana, Multen shell, Increase Burn Damage, In 4 link gloves, Increase area, Faster cast, Reduce mana, Conductivity in 4 link boots. You need faster cast to not slow your main skills down from firing.
Life leach and mana leach pretty much keep my bot 80% to 95% full life with arc even under super heavy fire.
You need an item with!!! Can not be stunned!
I mean god it works great for me tree is simple basic arc witch build. I have 300 mana after arua. Mana leach keeps it full easy! I know you all goign to tell me arc witch suck but gg they clear maps fast!