Exactly what it sounds, these are places that are either present in AUs or are AUs themselves.
“The Undertale section of the Multiverse is home to all Undertale AU´s, Undertale, Out of Code...The Multiverse (Undertale Section)
This category has the following 2 subcategories, out of 2 total.
Pages in category "Locations"
The following 30 pages are in this category, out of 30 total.