ebony male, alkosh and torugs pact for the tank (at least if you want to tank end content).
for the magnb siroria surely is something worthy together with mother's sorrow.

@IcedOver , Siroria is from Cloudrest trial, but I think that for more mobile fights, Burning Spellweave might worth using on front bar, since for Siroria you have to stay inside the circle to keep buff stacks. Maelstrom inferno on back bar is good to have; on the front, people like using either Mother's Sorrow or Julianos.

Well... if you want to get best numbers on a dummy, then probably Zaan. ^^ I tested recently, it is very strong. But it has limited range (and upcoming patch, nerfed even further - to 8 meters from 10), so in real situations, I'd look for something like Valkyn Skoria, maybe Ilambris. Grothdarr should be good, but I didn't try myself, and slightly doubtful since it also has limited range. For something like vMA, Iceheart is nice.