Usually known as "the Dragon of Hell", Phantom Blaster Dragon is the culprit of the large-scale civil war that scarred the history of United Sanctuary. Its true identity is one of the guardian dragons of the Sanctuary, who had been infested by the negative emotions released by all lives and as a result, its heart fell into the bottom of the dark hell on someone's hand.
At the end of the civil war, the Dragon of Hell was brought to justice by the Vanguard, and its soul separated into "Light" and "Darkness". Mordred---the holy soul with the power of the guardian dragon, gained his new body by fusing with a dying knight. Gust Blaster---the evil soul with the power of the Dragon of Hell, formed its new body with the negative emotion widespread in the world.
After the war against the invaders ended, peace had come to the Sanctuary once again. However, the remnants of the invaders caused the incident that alters history. There arose the possibility that "Phantom Blaster Dragon" could remain in its form to atone for its sins as a "Shadow Paladin", but as the incident ended, the possibility faded away, and the souls of light and darkness returned to separate axes in the original world.
At one point, the two souls with the same origin engaged each other without any advance warning. The two beings came to the land of their decisive duel, and fought against each other in order to annihilate their respective opponents.
Does the light defeat the darkness, or does the darkness devour the light, or do they both return to nothingness? The result of the battle and the epilogue... there are people who know the truth, but none have spoken about it yet. Will the dragon's story come to a finale, or---