These are essentially super humans capable of becoming an extremely lethal weapon. They are made out of bullet shell projectiles and regenerate their own ammunition. These bullets can cover their entire bodies for protection. I used a pretty cool method in #zbrush called nanomesh to wrap those bullets around a specified region. I rendered this in keyshot but would have loved to import it into C4D and render with octane but it kept crashing the program so +1 to Keyshot for being able to handle so many polygons.