The Great Ring Multiverse.

A century ago, regardless of the process, the battle between the Emperor Dragon and the Storm Lord in the material realm ultimately ended in the Emperor Dragon's victory. This turned the tide of the war between dragons and giants, earning him immense fame. The Emperor Dragon's renown echoed through every world and plane within the Great Ring, garnering countless loyal followers.

However, after this battle, the Emperor Dragon vanished without a trace.

Since then, information about the Emperor Dragon has been scarce.