Gaelion is a male dragon who was given to Naofumi as an egg, by an anonymous benefactor. Then later named by Taniko after he hatched. Until when he ate the Dragon Emperor's dragon core, they began to share the same dragon body.
Both Gaelion and the Dragon Emperor share the same type of power and have the capacity to mutate into another forms if required.
Their magic and memories can be transferred using the Dragon's cores.
They can use the rage as source of magic.