Roasters village massacre

Milo Sasuke, nicknamed Mils. Black boy, born with silver hair, in a village in the corner of Gloucester continent. At the age of thirteen, on the harvest day of his village, they were attacked by a Mongolian clan from another continent.
The village was massacred and plundered, he lost his parents, friends, and all sentimental value to the marauders.
After escaping this nightmare alone, he promises never to be weak again and vows not to see such a nightmare again unless he's the one performing the nightmare.