Rivens are extremely powerful, but rare, mods in Warframe that can turn any weapon into an endgame all-star if you get lucky with the rolls. They can provide a range of buffs, or nerfs, to a weapon, and if a player manages to score the right combination they can turn any weapon into a god-tier killing machine.

How often Rivens drop for specific weapons is referred to as their disposition. Weaker weapons tend to get more Rivens, while powerful weapons will rarely get them. This has kicked off something of a Riven market in the game, as the mods can be traded between players. Digital Extremes will often change the disposition of weapons based on the effect of patches, updates, and players figuring out cool interactions to give themselves an edge.

The most important thing to know about the February 2021 changes is that no Primary, Secondary, or Arch-gun Riven has received a reduction in disposition. Melee is still a more delicate area, as Warframe’s most prominent way to do damage.

Primary

  • Basmu: 1.1->1.15Bubonico: 0.5->0.6Catchmoon: 0.9->1Cedo: 0.5->0.55Dread: 1.25->1.3Fulmin: 0.6->0.65Kuva Hind: 1->1.05Lanka: 0.9->0.95Panthera Prime: 0.85->1.05Quellor: 1->1.05Rattleguts: 0.8->0.9Sporelacer: 0.5->0.85Sporothrix: 0.5->0.85Supra: 1->1.05Supra Vandal: 0.9->0.95Sancti Tigris: 0.9->0.95Tigris Prime: 0.8->0.85Trumna: 0.55->0.7Vermisplicer: 0.5->0.7

Secondary

  • Akjagara: 1->1.05Akjagara Prime: 0.85->0.9Akstilletto: 0.9->0.95Akstilletto Prime: 0.6->0.65Catabolyst: 0.5->0.8Hystrix: 1.15->1.2Pox: 1.15->1.2Pyrana: 0.9->0.95Quatz: 1.15->1.2Sepulcrum: 0.75->0.85Sporelacer: 0.5->0.55Staticor: 0.6->0.65Velox: 1->1.1Vermisplicer: 0.5->0.85Zakti Prime: 0.5->0.75Zymos: 0.75->0.95

Melee

  • Arum Spinosa: 0.5->0.85Atterax: 0.95->1Broken War: 1.1->1.15Cassowar: 1.3->1.35Galatine: 0.95->1.05Galatine Prime: 0.7->0.75Glaive Prime: 1.22->1.05Gram Prime: 0.9->0.8Guandao Prime: 0.5->0.6Gunsen: 1.3->1.35Synoid Heliocor: 1.25->1.3Hirudo: 1.05->1.1Jat Kittag: 1.25->1.3Karyst Prime: 0.75->1.05Keratinos: 0.7->0.9Kronen Prime: 0.85->0.7Ceti Lacera: 1.1->1.15Lecta: 1.15->1.2Secura Lecta: 1->1.05Mewan: 1.05->1.1Mios: 1.2->1.25Orthos: 0.95->1Orthos Prime: 0.6->0.65Pulmonars: 0.5->0.85Quassus: 0.75->0.95Rabvee: 1.25->1.3Reaper Prime: 0.85->0.75Redeemer: 1.1->1.05Redeemer Prime: 0.65->0.6Sheev: 1.3->1.35Sydon: 1.25->1.3Vaykor Sydon: 1.2->1.25Venka: 1->1.05Vitrica: 0.5->0.7War: 0.95->1Zenistar: 1.05->1.1

Archgun

  • Cortege: 0.7->0.85Prisma Dual Decurion: 0.5->0.85Imperator: 1->1.05Morgha: 0.5->0.7

And there you go, Tenno, all Riven Disposition changes in Warframe for February, 2021.