Tales of Remnant: The King of Beasts Book One: Body

The man patted his son on the head, he presented to him a giant sword made of a pure black substance with light blue markings and said "Someday my son, you will inherit this weapon. It was forged in the darkest pits of the world and has the power to travel through time to and fro and when that time comes, make good use of it." The man headed out, and was never seen again.