Your in a sci-fi futuristic time pariod you are a galactic fighter merine from the Cobalt military you are killing an ancient race of alien called leviathen molded they caused the orthenox virus which is like the molded virus from resident evil 7 biohazard they change in environments like the necromorphs from dead space these monsters create by the black ooze made by the leviathan beasts it's called the VX  virus an alien virus infects living creatures to there called infected much like zombies 