This is variant with maxed Umbra Mods.
If you, however, want to just smack the build link in your party chat to make everyone else silent:

• Without Umbra form

Do not polarize third naramon, 3 blank slots required.
Maxed [Intensify] + 2 Rank 4 Umbra mods from Simaris, or any other combination of these mods, that'll consume no more than 20 Capacity total.

• With a single Umbra form

Do not polarize for the third naramon, 3 blank slots required.
Maxed intensify + Maxed Vitality + Rank 5-6 Fiber.
Maxed Stretch

• Suggestions

If you do not care about anything but the Steel Essence, then I strongly suggest to build party with [Nidus] (somewhat same build required, replace larva with Empower, obviously). [Khora]'s [Pilfering Strangledome] provides enough Life Support packs.
x5 Tauforged Amber Archon shards grant +75% AS.

Grab a kitgun with Pax Bolt for additional 30% AS.
Keep in mind that headshots from other weapons trigger the effect as well, no need to do it using the kitgun.
There is a parazon mod https://warframe.fandom.com/wiki/Power_Drain. If triggering Bolt, Molt and GP is not enough for you.

• Numbers:

Stock AS for 1 Umbra form variant:
370%
Note: If you wish to go hard on it - smack 5 Tauforged Shards. That will result in 445% AS and ultimately 775-795% AS with all the buffs.

Total buffs (330-350%):
60% - Molt Augmented
50% - Empower
50% - Energy Conversion
50% - Power Drain
45% - Molt Vigor
30% - Pax Bolt
25% - Growing Power
Focus Buff - 40% from Sling Strength of Madurai or 20% of Hardened Wellspring.

• FAQ
  Why range?

Khoras usually prefer to move as less as possible. High range parameter keeps your [Khora] permanently buffed and far enough from the reservoirs themselves. No more requests to reposition them, no more whining.

WhY nO [Adaptation]?!

Because you just do not do anything. You do not need it. Grenade will kill you anyways, and an accidental shot will find you with zero stacks. Stay behind and enjoy.

Nidus Specter?
Because no clickbaits. The maximum AS achievable is around 3100-3300. The number is nice, but that is not "playing" anymore, that is self-harm that requires multiple people to waste their time.
The build is about Wisp. Farming another frame/asking a friend for a buff is not a part of your "kit". I've mentioned a comp with actual [Nidus], the rest is completely up to users. If the [Nidus] has 300% AS, then by the multiplicative buff, your 445% AS will become 778.75% and, after the buffs, result in 1108.75% AS total. That said, if the Nidus buddy also has 795% AS, then the bonus will be 1676% AS, since 445x(1+1.98)+350=1676.1%

Eclipse/Roar?
The build is for standard steel path fissure farm. [Wisp] is a support, not a mule, not going carry the entire team on my back. Since the build opts into range, the Roar will hold for just around 20 seconds.