In this guide, you will come to know where to get Constitution in Warframe.
Constitution drops from nightmare missions as a C rotation reward; you can only get the C rotation rewards from doing nightmare missions on certain planets.
C Rotation rewards can drop from Uranus, Neptune, Pluto, Eris, and Sedna.
Fortunately, the mod doesn’t have a very low drop chance, so it shouldn’t take you very long, or it shouldn’t take you many runs before you get the mod.
