This build is made specifically for steel path void cascade and is not optimal outside of it.

In this game mode, you need to purify exolyzers all over the map with your operator amp and stop thrax enemies from capturing them, while hordes of enemies harass you. This build aims to excel at every task, which are :

1. Purify exolyzer
2. Clear enemies
3. Kill thrax

To accomplish task 1 effectively, we have great mobility with a long duration reave. [Praedos] with the parkour speed evolution in the melee slot is recommended. Molt Augmented can be replaced with Arcane Agility for very high parkour speed.

To accomplish task 2 effectively, we use an aoe primary weapon like the [Kuva Zarr] boosted by [Garuda]'s passive +100% damage and [Blood Forge] to reload instantly. [Primed Sure Footed] or unairu's Poise is not needed as [Dread] Mirror now provides knockdown immunity.

To accomplish task 3 effectively, we first prime the thrax with 10 viral procs. My recommendation is a [Kuva Nukor] viral status fire rate build. Then we hit the thrax with seeking [Talons], which will convert subsequent damage to bleed procs (true damage). Once this is done we reave through the thrax, which will die in seconds if not instantly from having most of its health dealt as true damage.
Once in ethereal form, we switch to operator (madurai focus) and use our amp (777, 177, 577) to truly kill them. Magus lockdown is very helpful to stop them from flying away.

Short demonstration :

Build notes :

-Molt Reconstruct
This is basically [Garuda]'s signature arcane as it is only good on her if we're being honest. It enables you to have both infinite health and energy. Use bloodletting to gain energy, then any ability to gain health. In case you somehow run out of both health and energy, Magus Repair or Magus Elevate will save you.
If you have a low rank arcane equip a Bleeding dragon key to fully heal.

-[Kavat's Grace]
I am using this because of Seeking [Talons]; if you use it in the air, no matter how close to the ground, it will always result in a hard landing (unless you aim glide land or slide land). A hard landing will also happen if you traveled vertically with reave then land, and this can easily kill you. You can use Power Drift for a little more strength or Endurance Drift for more parkour speed instead.

-[Blood Forge]
If you prefer a weapon with no reload like the kuva bramma or simply dont want to run it, I suggest slotting Primed Continuity instead for longer Dread Mirror and Reave.

-Shield Gating
To achieve shield gating you need to equip [Augur Seeker] and [Augur Pact] on your secondary, which grants 120% energy to shield conversion with [Augur Secrets] on warframe. Using either Reave or Seeking [Talons] will refill your shield gate. You can use Brief Respite instead if your secondary's build does not allow for those two mods.

-[Primed Flow]
[Garuda Prime] has a very large energy pool at 360, therefore you can use regular [Flow] instead to save on forma or if you don't have it. With [Flow] you will get 600 max energy, with [Primed Flow] 800.

Thank you for reading and I hope this helps you. Criticism and questions are welcome.