Long ago, before the pyramids were formed, before a single human ever set foot on the Earth, laid a war between spirits. A war between the spirits that wish to give life to the Earth, and those who wish to destroy it and take the planet for themselves.
Four oppositions faced each other, the Crimson Faction, led by the Crimson Dragon. The Numbers, led by three generals, Star Serpah, Lucky 7, and Utopia. The Earthbounds. And the last, the Yubolia Faction, led by Yubel.
The battle lasted for ages, in what would have devastated all of them. However, in an act of desperation, the four factions each called for a warrior to end the war. Each called for one of the four elemental Kings.
The Crimson faction called for Ezno, the gold knight, and King of the Light. The Earthbounds called for the Gia Rook, King of the Earth. Yubel called for the Arben Dragon, the Emperor of Darkness. The Numbers called for Ether, the Red Dragon, the Warrior of Fire.
At the end of the Spiritual War, the three Elemental kings joined together to destroy Arben, but failed and were killed themselves, leaving Ether as the last King. In anger he created a rift in the fabric of space, a space in the cosmos where time does not exist. This place was known as the Shadow Realm. The King of Flame then banished the Yubel Faction, and went to guard the Spirits of light, as well as the human race.
However, as soon as peace was gained, it was taken away just as fast. Arben, the Emperor of Darkness returned to reek havoc to the Earth, and in an act of bravely Ether sacrificed himself to destroy the Emperor, but the battle between them wasn't over. For ages, the Warrior of Fire and the Emperor of Darkness have fought, using human hosts for battle. The battle continued, until Arben defeated once more and sent into another universe.
But with the impending danger, the Ether and Arben must fight together to protect both their worlds.