Focus is on Impact and Radiation to cover Half of the Corrupted Faction.
(Works on: Alloy +75%Rad / Shield +50%Impact / Proto +25%Impact / Robotic +25%Rad)
To cover the rest in the Corrupted faction, Cloned/Flesh/Ferrite/Fossil, Use Viral and Corrosive.
Viral will give +75% dmg on Cloned and +50% dmg on Flesh and is neutral on everything else (6/8).
Corrosive is +75% dmg on both Ferrite and Fossil BUT -50% on Proto (Negative on 1/8.. very good).
If you don't have a similar Riven, just use Electricity (convulsion/[Jolt]...)
All the best to you Tenno!