Thousands of years ago, the five Creatures Kings where the rulers of the Five Civilizations. When a war between humans and Kaijudo that threatened to destroy the entire world erupted,The Kings banded together with five human wizards to end the war.

The Creature Kings willingly sacrificed their mana energy so that the original Duel Masters might create the mystical veil that has ever since separated the human and Kaijudo worlds. Drained of almost all their energy, the five Kings fell into a deep slumber.

It appears the plan was originally to allow the Kings to recover their strength and awaken before sending them across the Veil so they might rule their civilization again, but at some point, the Order of the Kaijudo Duel Masters betrayed the Kings' trust, periodically siphoning off their mana, keeping them in hibernation for millennia. By the time Veil collapses, the Five Creature Kings will be reawakend and continue what they began Thousands of years

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