The necromancer, master of the dark arts, the original loot frame - Nekros!
Passive: Nekros and his Companions regenerates 5 Health when an enemy dies within 10 meters of him.
Soul Punch - A blow so powerful, it turns the enemy’s very soul into a deadly projectile, damaging all in its path.
Terrify - Casts fear into the hearts of nearby enemies, causing them to run away in terror.
Desecrate - Forces fallen enemies around you to drop additional loot.
Shadows of the Dead - Summons shadow versions of vanquished enemies to fight alongside you for a short period of time.
Acquisition: Main blueprint can be purchased from the Market. Component blueprints can be obtained from defeating Lephantis on Magnacidium, Deimos.
He’s far an away the worst weapons platform frame in the game. Is he playable? Of course, Warframe is an easy game! But you would be far better served by playing even a basic Rhino compared to Chroma. Base damage increases are just not really that valuable with gun arcanes providing you more than enough. A Revenant with max power strength and Roar subsumed is completely invincible and has over 100% multiplicative damage multiplier that double dips on DoTs. Wisp can prime enemies with Breach Surge while also buffing your fire rate and can easily run Roar as her 4 as well. Nezha goes fast, has a multiplicative damage multiplier in Chakram and can spread DoTs from weapons across a massive area with Divine Spears. Compared to those, Chroma just falls off completely, not to mention 2 of his abilities are boring buffs that could easily be merged into one and the others do absolutely nothing. He looks really cool, his theme of a knight that wears the pelt of a slain Sentient dragon is awesome but the frame itself just sucks.
My other counterpoint to this perspective is that, when I’ve had the absolute joy of playing with range Chromas, having Vex Armour buffs on is fun. He’s an easy Circuit pick for me, because like Banshee he directly makes the game more fun for everyone. Vex Armor also outscales Roar until 700% power strength, and outscales Roar forever on glaive maths and MultiCO projectile melees. (Ignoring certain triple dipping Roar mechanics, such as Blastfluence.)