Archon Shards
2x Crimson - Ability Strength. Pushes strength just above 272% strength for a maximum 95% slow from Gloom. If you have a Tauforged you just need 1.

Click 3, 1, 4, forget.

Ok, more complicated than that. Equinox has always been known for her aura like abilities with her 3 and 4 providing blanket buffs/debuffs. Gloom continues that trend with giving her a slow and a heal in a radius around her. Why remove her 1st and the ability to change forms? You don't need Night Form. Gloom provides the slow from her 3rd's Augment and also provides the healing that her 4th would otherwise give. The only thing you are missing is sleep, but 95% slow is basically sleep anyway. This is a Day Form ONLY build.

How to get 95% Slow? Simple.
1) Collect Energy Orb to proc Energy Conversion - Cast 3rd for Power Strength Buff.
2) Let 3rd Ramp up to its power strength cap, should go pretty fast.
3) Collect another Energy Orb to proc Energy Conversion again - Cast Gloom.

If you have 2 Crimson Archon Shards for Ability Strength, you should be at 278% Strength (165% Base + 50% [Energy Conversion] + 43% Provoke + 20% 2x Crimson Shards = 278%) which is just barely enough for the 95% Slow Cap on Gloom.

The reason we use [Energy Conversion] instead of [Transient Fortitude] is that since 3 out of her 4 abilities are channeled, you just need to cast 1 and done. Not to mention [Transient Fortitude] hurts energy economy for channeled abilities by nerfing duration. Keeping [Energy Conversion] up also isn't a hassle since only her 2nd Ability is an active cast.

So why Gloom other than it being Gloom? It synergizes with her 4th ability whose bleed procs can cause staggers and stuns, which those animations are now slowed by Gloom, effectively increasing the duration of the stun. It also synergizes with her 2nd ability, which is typically too annoying to use due to the obscene speed buff it gives enemies and usually ends up getting yourself killed. Gloom counter acts this. I'm not sure about how the math works under the hood, but it definitely still seems like a 80%+ slow when stacking Gloom and [Rage] together. So enjoy and make use of that up to 136% extra damage on enemies. This is the only ability you would be using regularly. Everything else is a toggle.

Since her kit lacks armor/shield strip I run Unairu focus and can use that to strip. But a solid weapon will carry you just fine honestly without needing armor strip. If you want to run Zenurk Focus for the Hardened Wellspring Ability (+20% Ability Strength) or Madurai's Sling Strength (+40% Ability Strength) to substitute for Archon Shards or a mod, that is also a possibility.