(The story takes place in a future Equestria, taking as reference the show.)
My name is Greasy Gear, I'm a scientist, this isn't my body, this body owns to other soul, an ancient creature who lived since the begining of the Solar Empire. He was named Slayer and he worked for the Royal Family, eliminating and banishing the crown enemies and sentenced ponies. After 8526 years Slayer was forgotten and then he spent about 400 years walking through Equestria. He was 9000 years old when the depression and the sorrow became unbearable, his soul left the body, that remained walking.
After 15875 years, several incidents occurred in another parallel