The Allomniverse (in other word, Omniverse complex) are regions inside Boxes which contain almost all Omniverses. These verses are close together only if the pre-Boxial beings conquered it with technologies advanced throughout the Barrel layers, and sized around 100 times the biggest central Omniverse.
Here, there are pseudo-Omniverses within a region, which are similar to central Omniverses with small differing properties and different proportions of existence ranks. These verses are bubbled nearby normal ones, and parallel to a Beyond's surface.
In non-closed Allomniverse regions, they are isolated in Barrels from a lower-kind Barrelverse, making it almost impossible to visit without special equipments. Also, these verses are spiraling outwards from Transcendentem.
Our Allomniverse[]
The Omniverses around our Omniverse are similiar to ours, but smaller. The story of their creations is written in the Omniverse article.
Upon their conceivement, they were relatively scattered, so after the documented beings conquered The Box, they brought all of the Omniverses and Pseudo-Omniverses together into one bunch and enclosed it in a barrier known as the Allomniverse.
The creators made it to be 100 times as large as the Omniverse, but the base 10 niceness of the number is accidental, it was much more akin to a random number to the engineers when they built it.
For a list of the 11 Pseudo-Omniverses, check the Pseudo-Omniverse page.