Archgun Rivens are the only Rivens that you can regularly get in the game, as these are part of the Arbitration Honors, from Arbitration missions. In Arbitration missions, you will earn Vitus Essence, which can then be taken to the Arbiters of Hexis on any relay and exchanged for rewards...
You should be able to get 25 Vitus Essence in an hour without any boosters, and booster users should get closer to 50. Turn in the Vitus Essence for Kuva, and you're looking at 10,000-20,000 Kuva per hour. Return to Quick Links Related: Warframe: How To Farm Aya Fast Daily ...