|Not part of Riordanverse|
|“||There are countless other universes above and beneath our own. Like pages in a book.||”|
–Sal Vidon, Sal & Gabi Break the Universe.
The Multiverse is a series of infinite universes that never meet unless there is interference.
Sal Vidón looks into the multiverse when finding a way to get Gladis Machado to not be afraid of him. Later that day Gabi Real puts her head into a portal leading to another universe. A few days later Sal and Gabri search the multiverse in a last ditch attempt to cure a dying Ignacio Real.
An alternative Gabi Reál takes Sal to her home universe after his father in that universe unintentionally destroys it with the Remembranation Machine. After reforming she takes Sal and Gabi to a universe where she has imprisoned various Gustavos from around the multiverse.
Sal goes through various universes while chasing Gladis Machado. As he does so he is seen by various people throughout the multiverse.
- Organic material can stay in a universe indefinitely while inorganic material quickly returns to its original universe.