My khora used for Sedna arena vodyanoi (steel path and normal work fine) for endo farm.
I add augur reach (or stretch rank 4/rank 5) cause it's my preference, if you dont like it you can drop it for something else.

[Primed Sure Footed] (or [Handspring]) and [Rolling Guard] is nice optional QoL and can be substitute with other thing base on your preference. [Rolling Guard] just to shake off any harmful status proc like heat, cold, electric, slash and for near dead moment to buy some time.

Aura is again preference, you can switch to [Swift Momentum] for combo duration melee. CP is nice to have on steel path since enemy got more armor there

Arcane energize and zenurik energize dash will provide [Khora] and [Nidus] sufficient energy for the farm. If you dont have arcane energize, I highly recommend to use [Rage] or [Hunter Adrenaline] to provide you constant energy to cast dome when you got "reduce ability duration" modifier.

You should also equip the [Venari] with [Fetch] to [Vacuum] all the endo around you and (primed) [Animal Instinct] to spot endo on radar

[Ripkas] would be the preferred weapon for the this farm because its unique mod (this allow [Khora] dome and whip to cut corpse for [Nekros] to desecrate)

My Ripkas build: https://overframe.gg/build/64984/

Best team composition for endo farm is Khora, Nidus, Nekros, Nekros
My Khora build : https://overframe.gg/build/64978/
My Nidus build: https://overframe.gg/build/64982/
My Nekros build: https://overframe.gg/build/64980/

Helminth option: Spellbind to remove [Primed Sure Footed] and grand status resistent to your team, Decoy to hold the door