This build:
•Requires no combo
•Can one shot most enemies
•Gives all frames a full heal [Inaros]
•Gives a speed boost
•Has long range (35m)
•Comes with Innate piercing (2m)
•Has a 1x disposition
•Does not use light attacks at all

Stats displayed on this build are inaccurate as damage for heavy attacks are not shown. Stats displayed in Warframe are also inaccurate as only the damage shown for the melee attack are shown and not the thrown daggers.

[Dispatch Overdrive] is cheap to buy or can be replaced without much consequence; good place for rivens, faction mods, flat damage mods(I recommend [Spoiled Strike]), some other utility mod or crit mods.

It does not matter which stance you use, the result is the same.

Attack speed will not increase your heavy attack speed.

I suggest a riven with +melee damage, +crit damage, +crit chance. Initial combo can work if it is over 20

[Primed Fever Strike] can be replaced with [Spoiled Strike] to increase slash status and decrease forma cost at the price of instant damage. It's not as if you really need more overall damage.

Mechanics

Slash status damage can be increased using: flat damage mods, faction mods, crit damage, headshots and combo multiplier.
Slash is guaranteed on heavy attack daggers and overrides any other status you might want to proc. Hitting enemies with the fans can still proc statuses as normal

You will step forwards before throwing the daggers which can cause you to miss. The first throw will throw 12 daggers with a 2.5x damage multiplier a second consecutive throw will throw 6 daggers with a 5x damage multiplier. Daggers will spread out in an arcing horizontal line, this arcing does not really affect how you should aim.

Daggers are effected by [Octavia]'s Metronome and and [Mirage]'s Hall Of Mirrors.