Warframe‘s Iceblade of Narin introduced Entropic Kuva, a new variant of the coveted red resource. It has nothing to do with Rivens, though: the blue version lets you get the 66th Warframe, Narin, and other drops.
Entropic Kuva is at the heart of the Iceblade of Narin update, being the main resource involved with saving the Zariman and helping Cephalon Melica. To tie that into the lore, this resource has specific drop sources aboard the Ten-Zero. Here’s how you can get it.
Where to find Entropic Kuva in Warframe

Entropic Kuva drops from special Entropic Eximus enemies aboard the Zariman in Warframe. They’ve spawned in every run we’ve had so far on both Normal and Steel Path, and each dropped between three and five Entropic Kuva. Pickups seem unaffected by difficulty, companion mods, and Resource Boosters, which would have been nice to know before I bought one. Oh, well, real science requires sacrifice.
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If you can take on the Steel Path, however, there’s an upside: the Zariman is one of the best Arcane farms in the game, so having a Mod Drop Chance Booster active during your grind can pay off.
Where to find Entropic Eximus in Warframe

Entropic Eximus appear randomly in missions in the Zariman. They’re surrounded by a ball of Kuva, and you have to walk into it to shoot them. Think of them like cooler Arctic Eximus.
In our experience, each mission will have a handful of Entropic Eximus spawns. We did five runs of Halako Perimeter (Exterminate), with around three spawns each, but your mileage may vary in longer missions such as Void Flood, Cascade, or Armageddon. Narin’s blueprints are scattered across the Zariman, so doing different missions may pay off.
How to use Entropic Kuva in Warframe

You can exchange Entropic Kuva with Cephalon Melica either on the Chrysalith aboard the Zariman or in Yuvan Peak on Earth. Her inventory is full of goodies, including parts for Narin, her signature bow Nunchasa, and her Aksondol dual pistols. You can also snag some armor, weapon skins, and cosmetics, so back to the Zariman it is.