My easy and satisfying 2 forma Supersonic Crit Hammer. (Noobs friendly being one myself)
Starting with finding a bunch of enemies, do the forward+[Parry] combo to gain a fair boost for the combo counter and start a killing spree worthy of a war god. (I exaggerated it, this build works wonders up to level 100/110 enemies, I haven't tested on higher levels enemies outside the simulacrum)
In general it might do its job better with a damage boosting ability like [Rhino]'s roar, I tried it in the simulacrum with [Xaku]'s 1 against sentients and it works just fine with 100+ level enemies (as it removes their resistance thanks to the void damage imbued by the ability)
As for the base element I picked toxin just out of personal taste, but it should work with whatever as it focuses on the crit and speed