An Omniversal Empire is an Empire with influerence outside of their Multiversal Cluster. As long as they maintain a complete control of two or more Multiversal Cluster in the highest layers, they're an Omniversal Empire. Only three Omniversal Empire exist in the Omniverse.
List of Omniversal Empire Edit
T.S.A.B (Control their own Omniverse)
Xeno Empire (Once they were a strong Omniversal Empire, now they're a source of cheap labour)
Zen Seibertron Teikoku (They control half the highest layer)
Red Gaia Empire