To make a Realm, Noah had originally planned to go through the upgrading of tiers of the Spiritual World into a Spiritual Realm.
He wanted to observe this process before he fully committed to the grand undertaking of elevating his homeworld and the many other connected worlds into a singular Realm, this idea seeming feasible if he combined the status of all his connected worlds and fused it all together to create a Realm!
Yet now, he looked at the upgrade of his Spiritual World and his connected worlds in the same manner. His Spiritual World was also connected to him, which also meant it shared a connection with his Homeworld and all the other worlds. So why not use the upgrade of tiers into the Spiritual Realm as the conduit for the fusion of all his connected Worlds into an even grander realm…?