Realmspace Astral Sphere

The Material Plane

The Material Plane consists of the Sun, planets, and other bodies floating within Wildspace.

Wildspace

The Wildspace surrounding the celestial bodies is without gravity and air. Movement is only possible with a Spelljammer or some other device that can create propulsion.

Other Planes of Existence

Several planes can be accessed through the Material Plane.

Feywild and Shadowfell

The planes of Feywild and Shadowfell represent positive and negative energies, respectively. They exist within and around the Material Plane. These planes and the Material Plane are held in place by the Ethereal Plane.

The Elemental Planes

The Material Plane sits in a cradle of Elemental Chaos. It is a chaotic mixture of elements. Within this cradle exists the Elemental Planes of Air, Water, Earth, and Fire.

The Astral Sphere

The Astral Sphere, sometimes called a Crystal Sphere, is a cloudy atmosphere containing all of the Material Plane. From the outside, it appears to be a cloudy, silver orb floating in the Astral Sea.

The Astral Sea

The Astral Sea is a vast ocean. Unlike Wildspace, you can breathe in the Astral Sea. You also do not age or need sustenance to survive. Movement in this environment is as simple as thinking; your physical stamina means nothing as far as movement. Rather, the more intelligent you are, the faster you will move. Via the Astral Sea, it is possible to reach distance spheres.

Outer Planes

The Outer Planes orbit the Astral Sphere. The Upper Planes are good-aligned and connected by an Infinite Staircase that spirals between planes. The staircase connects to the two neutral-aligned planes. Also connected to the Neutral Planes is the River Styx, which connects all of the Lower Planes

Upper Planes

The good domains include Arcadia, Mount Celestia, Bytopia, Elysium, The Beastlands, Arborea, and Ysgard.
Ysgard
Ysgard is a rugged realm of soaring mountains, deep fjords, and windswept battlefields, with summers that are long and hot and winters that are wickedly cold and unforgiving. Its continents float above oceans of volcanic rock, below which are icy caverns so enormous as to hold entire kingdoms of giants, humans, dwarves, gnomes, and other beings. Heroes come to Ysgard to test their mettle not only against the plane itself, but also against giants, dragons, and other terrible creatures that thunder across Ysgard's vast terrain.

Neutral Planes

The two neutral domains are Mechanus and Limbo.

Lower Planes

The evil domains include Acheron, the Nine Hells, Gehenna, Hades, Carceri, the Abyss, and Pandemonium.