I mean if u focus one rune go only wynn. If u focus something else, depends what u do. I myself play with two wyn+yul.
Orc is really slow, so for regrouping with party its very usefull.
Go BW robe, because light eats to much mana pool as well as mana regen.
Mass pvp mainly you focus on the target thats nobody focuses in game > tanks. U just Freezing Flame, if he goes ud, Fear also. Never go less than 1.4 k mana if its not needed, to have for rebuff later. For example if bishop makes mass res on 5 ppl u can fast rebuff WW+haste+mdef+pdef+reflect.