Heavy Spam Incarnon [Nami Solo].

Entering Forced Melee mode by holding F and then manually blocking makes it much easier to time your inputs to repeatedly to the spin part of the heavy attack chain, which has a huge radius, a force slash proc, and lets you move freely while attacking.

Requires [Ready Steel], sourcing attack speed from your Warframe (Intended for a high duration [Gauss] build), and Viral priming by your companion. Violet Melee Critical Damage Archon Shards also greatly increase damage output.

Incarnon Upgrades:
Brigand's Frenzy (Doesn't really matter, 4 seconds is incredibly short and you already have a ton of attack speed)
Lone Blade
Versatile Creed

[Carnis Mandible] completes the Carnis set for status immunity while killing, and also increases status output and slash weighting to complement the forced slash procs. [Virulent Scourge] adds toxin damage to bypass the shields of SP Corpus enemies, and Shattering Impact allows you incidental armor strip on boss enemies with capped slash procs. Everything else are fairly straight-forward damage increases or utility.

If you get good riven roll with initial combo on it, you can replace [Ready Steel] with [Swift Momentum] and dropping [Amalgam Organ Shatter].

[Gauss] + Overshield is alone not enough to max out Melee Retaliation, but it still gives a simple and consistent damage bonus. The extra damage isn't really needed though, so you can easily replace it with whatever other arcane you want, though then you might consider replacing [Amalgam Organ Shatter] with [Killing Blow] in that case, though since you also get melee damage from the Incarnon Transform and Kinetic Plating the different is fairly negligible.

If you run Melee Fortification you can make [Health Conversion] on the frame a flex slot.
Melee Crescendo could give you some massive combo multipliers on your heavy attack, but requires a bit of setup, and you would need melee efficiency for the combo bar to refill between swings.

Since your critical chance from the Steel mods and rivens is doubled on heavy attacks, Melee Duplicate requires 122% critical chance before doubling to have the highest chance of proccing while using Versatile Creed, which you can get very close to with just a regular [True Steel]. If you instead want to run it with Absolute Dominion for maximum status output, you would need 283% before doubling, which you can get very close to with [Sacrificial Steel] + [Sacrificial Pressure], dropping [Amalgam Organ Shatter] to fit it.

Intended for use with Weapons Platform Gauss v3