Tenkai Dragon

The Tenkai Dragon is a powerful creature that lived on Quarton. It was summoned by Vilius to combat the Corekai. Unfortunately, it proved to powerful, and he lost control. It was later defeated by the Tenkai Knights, who caused it to shatter into the five Dragon Cubes, which were scattered across Quarton.

Reviving the Tenkai Dragon
In order to awaken the Tenkai Dragon, the five Dragon Cubes must be combined, and one of the two keys must be used to unlock either the Dragon's good side or it's evil side. The Tenkai Knights managed to find the White Key and unlock the Tenkai Dragon. However, it was captured by Dromus for Vilius.

Currently, Vilius holds the Dragon prisoner, siphoning off portions of its energy to empower his Corrupted troops while Gen and Beni search for the Black Dragon Key on Earth.