This build will definitely let you solo any Steel Path missions of your choice... as long as you also include the builds I have for his Shadow and the frame. Fairly expensive build, but its definitely worth it. But I'd wait until his Prime variant comes out before attempting this build. You could reduce the amount of Forma used if you use an Umbral Forma on it instead of on the slots with [Virulent Scourge] and [Vicious Frost].