Grayson was born in Dacia in the year AD 325. He grew up a farmer and became an immortal in 365 fighting the invading Goths. Found and taught by Darius, Grayson became second in command of Darius' armies. Grayson saw Darius as a father figure, not just an Immortal mentor.

After Darius became a pacifist due the Emry’s Light Quickening, Grayson felt betrayed. Darius no longer believed in their cause and laid down is arms.

Over the centuries, Grayson became one of the most powerful Immortals in the game, and killed many Immortals. Some watchers assumed that he would become the one.

In modern times Grayson became a wealthy arms merchant and his Weapon of choice when dueling other Immortals was a Kris Broadsword.