This build is best utilized in hours-long lockdown survivals with an Armor stripping Warframe like Ash, Saryn, Mag etc.. or a squad running 4x Corrosive Projection.

1. Viral Damage will decimate any health-based enemy without armour, additionally, the procs will half the effective HP.
2. Radiation CC's the crowd and renders Ancient Healers useless.

I take this build against level 500 enemies in T4 Orokin Survival Mot.

Notes: This is not a destroyer of planets or one-shot build, but it is intended to synergize with your frame and weapons and gives you incredible control over the enemy population and murders them for you with the disc. It does not work with Combo Counter, [Blood Rush], [Maiming Strike] mods.

Good Riven stats to look for are Attack Speed + Range + Melee Damage.
Run with 2x Arcane Strike for even more SPEED.