Umbra crit melee build
max level mods for all but life strike which should stay unranked.
umbra: steel charge, handspring, umbral virtuality, umbral fiber, umbra intensify, gladiator resolve, primed flow, armored agility, vigor/primed vigor, rush, 2 arcane fury.
dual keres: carving mantis, primed fevered strike, blood rush, life strike, berserker, drifting contact, condition overload, riven with starts improve cc, cd, and dam, and neg puncture, impact or cd on slide.
method of attack: quick successive attacks to build up combo. Bigger the better. Use life strike to restore health as need (recommend when health drops to 300).