Motivation
This build uses cold Thermal Sunder to build Redline instead of Mach Rush. The idea is that when you Mach Rush to build Redline you throw enemies everywhere and you can't attack which a DPS loss. We want to be able attack and build Redline fast because its more fun :)
Playstyle
Simply cast Kinetic Plating and Redline then go kill things while casting cold Thermal Sunders until you're at 100% Redline. The high efficiency allows spamming Thermal Sunders and casting it does not interrupt your movement nor your attacks (melee/shooting).
Cold Thermal Sunder + [Archon Flow] pair nicely to get you a few extra energy orbs and Kinetic Plating should help with energy management but given that we're at a high efficiency we should not need [Equilibrium].
Cold Thermal Sunders will also slow enemies so they don't damage you (reduces Redline gauge) while your Redline is filling up. Also note that Eximus units are still slowed by these cold procs (up to a maximum of 4 stacks).
Once your Redline is maxed you can spam hot+cold Thermal Sunders to armor strip but you can still do this even if your Redline isn't full because of the high efficiency.
Damage Reduction
We have to [Reach] 100% strength for 100% damage reduction at 100% redline so pick your poison:
Option 1:
Equip TWO crimson archon shards (+20% Ability Strength) for 104% strength = 100% damage reduction.
Option 2:
Equip ONE tauforged crimson archon shard (+15% Ability Strength) for 99% strength = 99% damage reduction.
Option 3:
Equip [Power Drift] instead of [Cunning Drift] for 99% strength = 99% damage reduction. This requires changing the forma on the exilus slot. You also lose the +15 range from [Cunning Drift] but that's honestly not a big deal. The deciding factor for be was that I could get the needed strength from archon shards and that I like sliding a lot in my movement so extra range can't hurt. You can also slot the exilus slot out for anything else to be honest.
Arcanes
I'm not using Molt Augmented because I don't like the build up time and I'm using a melee weapon so Arcane Fury is more DPS.
Helminth (optional)
I'm using Wraitful Advance for more DPS and to make up for the loss of movement from removing Mach [Rush].