Your creator, Kurieita no buki, was known to make the best weapons. The sharpness blades known to man, the strongest staffs across the lands and the best designs in the world. His weapons are high quality and priced so would be constantly be stole if he wasn’t an amazing fighter. But he wasn’t proud he wants to make the best weapon/fighter ever possible so he spent years away from civilization so he won’t be able to get distracted. He forged his own steel form the rarest and strongest ore in the mountainside; he spent months craving wood from Holy woods around the woods. He in case this weapon in a human like body able to move, think, and feel emotions like a human but it was able to transform any part or whole body into a weapon. You wake ( in the body of the walking weapon ) and see Kurieita no buki on your side and his is filled with happiness and excitement that his creation is alive.