Rider of Grimm

There is an ancient myth of a single man who commanded armies of Grimm. Legends tell that he almost wiped out humanity, and that one day he will return to finish the job. It is said that all life on Remnant will be destroyed. Most fear the end of the world and would do all they could to hold it off but, some want the story to end and what is the world if not one big storyboard?