One of my most favourite melee weapons in the game

GOOD THINGS:
High crit chance, VERY high crit dmg, 75% slash, good attack speed
BAD THINGS:
stance ragdolls enemies, bad range

Now to the mods I'm using:
Blood rush - gives us 440% crit chance(orange crits)
Weeping wounds - gives is 440% status chance(we reach 100% status)
CO - we have viral and slash, stance has a forced impact proc
Gladiator vise - no need for more attack speed than it gives us, passive is also going to give us occasional RED CRITS
60 60 mods - we don't use pure damage mods because we want to keep viral and slash balanced, one of the mods is unleveled for the same reason
Organ crasher - we NEED to take advantage of that juicy 2.6 crit multiplier, can be swapped for amalgam version
reach prime - must have on this weapon due to the bad base range

Claws have forced slash procs on their heavies, think about that
I strongly recommend using warframes that can [Negate] unwanted ragdolls from the stance([Nidus] and his larva for example)
The stance I using has bad walking combo compared to Vermilion Storm so use that stance in case you want that type of gameplay