If running Solo dps with enhanced engine, run this build.
If running Solo dps on classic engine, replace primed fury with spoiled strike.
Always have speed active before you throw contagion in Solo.
-Range rivens are preferred for not accidentally losing stacks by colliding with the eidolon or volt shields/terrain, but is not required (especially with [Balla]'s base range), however you need some damage boosting stats for this to be viable for solo one tapping.

If using for Vs to to kill lures and vomvs, any -range riven is preferred, but not necessary, and you don't need any damage stats on the riven, you can also replace more of the crit dmg mods with speed ones if you'd like.