To reroll a Riven mod in Warframe, go to your Orbiter’s Mods station, select the Riven, and use the Cycle/Reroll option with Kuva as the cost. You then choose whether to keep the new roll or keep the old one.

How it works

  • Rerolling changes only the Riven’s stats, not the weapon it applies to, its rank, polarity, or Mastery Rank requirement.
  • Each reroll costs Kuva, and the cost increases over repeated rolls up to a cap.
  • If the new stats are worse, you can reject them and keep your previous roll.

Practical steps

  1. Farm some Kuva first. Common sources include Sorties, Kuva Siphons/Floods, Kuva Survival, and some Nightwave rewards.
  1. Open the Mods terminal in your Orbiter.
  1. Select the Riven mod you want to reroll.
  1. Click the Cycle/Reroll option and pay the Kuva cost.
  1. Compare the new stats and confirm the one you want to keep.

Quick note

A fresh Riven may be veiled, so you usually need to unveil it with its challenge before rerolling stats becomes useful.

TL;DR: get Kuva, open the Mods station in your Orbiter, pick the Riven, reroll it, and keep the version you like best.