- "It will not come as a surprise to many of you that there are other worlds besides our own. This is not conjecture, it is fact. I have never been to these worlds, and you will never go there. The art of passing between worlds is an area of magic about which very little is known. But we do know some of these worlds are inhabited."
- —Henry Fogg[src]
The Multiverse is the collective term for all parallel worlds and dimensions in existence.
To be added
Known Worlds and Dimensions
- Physical Plane: The dimension where Earth is located, alongside other planets and galaxies. It is home to Fairies, many Magicians, and various magical creatures.
- Astral Realm: A dimension in which the astral form of Magicians exist detached from their physical bodies.
- Neitherlands: The nexus point of all knowledge in the universe, the Neitherlands is a series of ring-shaped planets that exist outside of the natural flow of time. The Neitherlands was later made into the home of the ultimate repository for any and all information on everything in existence, from books written or unwritten, to the entire lives of all beings. It is home to Neitherlanders.
- Fillory: The home of the Wellspring, Fillory is a magical land mass ruled by gods Ember and Umber and the setting of the Fillory and Further series. Originally created to contain the Nameless in Castle Blackspire, Fillory was later flipped over by the ram gods and the nations of Fillory and Loria were created to amuse Ember. It is home to Fillorians, Lorians, Centaurs, and Dwarves.
- Fairy Realm: The Fairy Realm is an enigmatic dimension constructed by one of the Seven Golden Keys following the Fairies' migration to Fillory. In the Fairy Realm, time is said to fold in and accelerate on itself, making one age faster than in the Material Universe. The Fairy Realm is also home to Shadowbats.
- Poison World: The Poison World is a planet utilized by the Order of the Library of the Neitherlands to safekeep dangerous books, such as books containing god-killing spells, as well as the Books of members of the Order. The Poison World earns its name due to the amount of radiation that visitors are exposed to.
- Underworld: The Underworld is the dimension that souls and Shades of the departed go to rest. It was founded by Hades and his queen Persephone, who created Underworld Meadows to tend to the needs of the dead. It is where Shades reside.
- Mirror Realm: A dark parallel of the Material Dimension, the Mirror Realm is a dimension that exists between mirrors. Magicians developed Mirror Bridges to avoid traveling through the Mirror Realm due to its twisted properties. The Mirror Realm is the home of Shards and Trolls.
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