The Three Worlds
The Three Worlds are three separate but interconnected planes named Cærulus, Ilkeas, and Midrun. These are the common planes of existence for mortal beings, and mortals are able to travel between them provided they can travel to one of the many connections that bind them together, usually portals and gateways that are well-known and typically clearly marked, but sometimes travelers unwittingly stumble upon previously unknown"soft" spots between the worlds and find themselves accidentally transported from one plane to another without knowing it. Sometimes the ways between the worlds move for reasons that even the sages find mysterious.
The Færie Realms
Adjacent to and coterminous with the Three Worlds are the Færie Realms, inhabited by the mercurial and often capricious creatures collectively known as the "fæy". Unlike most of the Lords of Heaven, who reside in the Heavens, Brid makes her home in the Færie Realms. Both the Seelie Court and the Unseelie Court are found in the Færie Realms, presided over by powerful and unpredictable rulers of the fæy.
Positioned "above" the Three Worlds, the Heavens are the realm of the Celestial Lords. The Heavens are where the Great Hall of the Heavens is located, where Hlín tends the Divine hearth, and where Woda sits upon his Celestial Throne. It is where Forseti's fortress of Glintir and Þunor's great hall of Bilskinir floats upon the thunderhead Þruþheim.
Lying "below" the Three Worlds are the Hells - a realm of imprisonment and punishment for the wicked. Of course, the most important denizens held within the Hells are the Demon Lords, who both rule over and are imprisoned within this realm. This is where Bål was crushed under an entire mountain, and Iku-Tyrma was imprisoned within a great glacier, and Lug wanders an endless cavern forever seeking an exit. This is where the Infernal swamp that serves as a refuge for Lyßa and a prison for Kalma is located. The Hells are the home of dæmons, demons, devils, and creatures even more horrifying.
The Elemental Planes
Surrounding and bound to the Three Worlds, the four Elemental Planes of Air, Earth, Fire, and Water are the fundamental building blocks of the world. Some scholars maintain that the Elemental Planes don't actually exist as independent entities, but are rather part of the Three Worlds themselves where concentrations of the element in question are particularly strong. Even those scholars who hold to the notion that the Elemental Planes exist as planes in their own right describe them as being interlaced with the Three Worlds, with the planes described as crisscrossing the Three Worlds like a latticework.
The Realms of Shadow
Of all the planes, the Realm of Shadow is the least understood. Some scholars don't even believe this realm exists as its own entity and that all of the evidence that is used to support the notion that it does are simply misunderstood pieces of the other planes of existence. Others insist that not only does it exist, it must exist as a necessary side-effect of the shape of reality. The Realm of Shadow is held to be, quite simply, the extradimensional "shadow" cast by the other planes, surrounding them in a poorly understood primal state of semi-being.
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