The deadly duality, two warframes in one, I sold my original one before Helminth and don’t have the mental fortitude to get another one now - Equinox!

Passive: When Equinox collects Health Orbs or Energy Orbs, 10% of the restored amount is converted into additional Energy and Health respectively.
Metamorphosis - Switch forms, temporarily gaining bonus shields and armor in Night-Form, or bonus damage and speed in Day-Form.
Rest & Rage - In Night Form targets are put to sleep. In Day Form targets become more vulnerable to damage.
Pacify & Provoke - In Night Form reduces damage inflicted by nearby enemies. In Day Form increases Ability Strength of nearby allies.
Mend & Maim - In Night Form, allies are healed with each nearby enemy killed. In Day Form, nearby enemies are bled and then subjected to a wave of slashing force.

Acquisition: Requires a unique method to craft: Tenno must forge both the Equinox Night Aspect and Equinox Day Aspect in the Foundry – each of which requires its respective Neuroptics, Chassis, and Systems – before the Warframe itself can be built. Component and Aspect blueprints can be obtained by defeating Tyl Regor on Titania, Uranus. Main blueprint can be purchased from the Market.