Realm

Realms are similar to dimensions, but are completely separate from the dimensional system of 1D-7D. They are generally smaller and much more limited than dimensions, typically being incapable of sustaining most life.

Realms typically play a cosmic role in the multiverse, containing the power of multiversal constants. The Aether Pool is an example of one of these realms, as it provides the ultimate source of all sentience in the multiverse.

They may be created artificially, but the process has been described as excruciatingly difficult and hard to control.