Please keep in my that this build is very expensive but worth it. This will be your favorite melee if you use this heavy attack build. Just spam heavy attack & the enemies will be dead by the [Wise Razor]'s heavy attack slash proc. Tested on Shadow Stalker via Steel Path mission, one hit slash bleed kill even though faction mods not affecting him. Angst? Misery? Nox? Sentient? No matters what the enemies are they will die.

Endurance run: Tested on Grineer Steel Path solo survival mission [Nekros Prime] facing level 500+ enemies. One hit slash bleed up to level 350+ enemies. Twice hit for upper level than that.

With good riven, this weapon is too OP but you need umbra forma. Remove the [Killing Blow] for the riven. CC+, CD+, last stat Melee Damage+ or Element+ or Puncture+ which one you ever get, Heavy Attack Efficiency- or Finisher Damage- or any harmful negative.

If you are lazy to swap the faction mods, [Gladiator Might] is the best option. No need attack speed for the heavy attack.

Cheers mate.