World Hopping through the Neitherworld
At one point, many Eras ago portals had once been constructed to easily get to the Neitherworld before they were destroyed on most of the worlds (Especially in Gotham and Earth.) In order to get to the Neitherworld now one must be able to open a doorway in to the world of special pools that are portals to other worlds.
To do this one must be magically powerful enough to open a doorway straight to another world or Neitherworld. Be a traveler (Magician), obtain a coin which is a one time use (Needs ten years to recharge for its next use) or obtain a rare magical button that has limitless uses.
THE WORLDS
Earth
Umbrella Corp has their hands in everything. Hunters chase/kill monsters. Magicians have a school to learn magic safely. Currently on the brink of destruction of a long awaited Apocalypse angels designed.
Gotham
World run by vampires and its Vampire High King. Humans are seen as food or useful. Time of passage runs faster than earth and often noted that there are more night hours than day hours (Like Winter solstice only without snow.) The City of Bones is a place where the dead are taken and is also the passage to the underworld. There are twin cities called Metropolis and Zellwood.
Fillory
Long lost mythical magical world. All inhabitants are versed in magical knowledge of sorts. There are 12 unique beasts that have special abilities that they can bestow onto someone who captures them. It holds the magical well-spring that is where all Magicians and most magical creatures draw their power from. It currently is without leadership and living in fear of an Evil Magician.
Gasa
A world of islands and similar to Earth. On the largest island (about as big as Australia) there lies the Limitless Fortress. It is a harsh, chaotic place and subdivided into three specific tiers – Lower Town, the Beltline and the enigmatic Babylon City. It is said it was, at one time, the place for the unique to fit in. Time seems to both stop as well as flow at the same time.
A world mostly consisted of forests and rivers and some marshland. Its inhabitants are mostly Faye, Dryads, Nymphs, goblins and dire wolves. Rumored to have Unicorns eons ago, but they were supposedly driven into the sea by a Red Bull, but it turns out that they were eaten.
Naesetora
A world consisting of many what some would call pocket dimensions or alternate planes of reality. It is a dangerous, unforgiving place that often takes the immense guilt and insanity of those unlucky enough to cross into the world and twist it into unimaginable nightmarish creatures. Once thought to be the original home-world of the Leviathan and the Auphe due to the sheer amount of brutality.
Eoniven
A world much like Earth, however it is a world linked through the Limitless Fortress through unknown reasons. Eons ago it once had a portal but know one knows what happened to it. A third of the world population has what is called the X-Gene, once triggered, they have special unique abilities than can be quite deadly. It is also Sinister and Xavier's home-world to which they spread constant chaos to keep it lively.
Praelagus
A world similar to Gotham that is ruled by the Emperor. Time here runs slower than Earth does. There are eight smaller countries on the mainland (each with their own feudal lord) west of Fortuna Island and it's grand cathedral, palace and battle arena.
OxeniaA world similar to Earth but has a more futuristic and yet western type world. There are AI hotels, automail clinics that can help those who have lost limbs and spaceships that travel from planet to planet.
Obitora
An Earth-like 1900's steampunk world where cities were built in the sky which requires airships to travel between. It is a Theocratic police state where one man is worshiped as a divine prophetic figure and those before him like religious icons. There is racism (segregation) and elitism, pushing the world one step closer to revolution(Civil War).
Pidara
A world that seems to have a secondary water world. Oakmont is the largest port city having what seems like endless flooding issues, causing some people to have visions, others driven to hysteria or madness. Innsmouthers are fish like lower-class citizens.
Thearia
A world that is a magical world and the basis for what Earth calls it's 'Fairy Tales'. It is vast and has many many different lands and rulers. Is is where Rumpelstiltskin is originally from though he will never admit it. It is considered in one's best interest to have someone who can use magic be on your side.