In this guide, you will come to know where to get the Lethal torrent in Warframe.
Lethal torrent drops as a C rotation reward from completing nightmare missions with special modifiers that make them a little harder than normal missions.
Only a few planets can you complete nightmare missions to get the C rotation rewards; these planets are Uranus, Neptune, Pluto, Eris, and Sedna. It is recommended to bring good survivability, rhino, chroma, nidus, and inaros for these missions.
It won’t say it won’t take you long, but it might not take you as long to get as other things.