The Xennaverse is a collection of multiple Yottaverses and is contained by a Wekaverse. Its size is 44 Duodecillion to
Yottaverses
The Xennaverse is quite unstable. Strings here are so broken that they can seemingly exist and not exist at the same time, or neither exist nor not exist. However, despite this, it is still really rare that you will manage to escape the Box by teleporting into another reality using this.
The strings can even teleport things to them like Glitchonicite. Unfortuantely, this means that the Xennaverse has an unusually large amount of Glitchonicite, which constantly corrupts the Metabubble that it's in.
That has made surviving in this verse harder that usual, and also means that the next few verses are "mashed" together somewhat.