Astral Plane
The Astral Plane is, quite literally, the plane of stars. More precisely, it is where the stars and portals to the heavens reside—an infinitely vast celestial void that surrounds all the worlds of the Material Plane, Elemental Planes, Feywild and Shadowfell. Every world—whether round, flat, or some other shape—exists in an airless void known as Wildspace. A world might be solitary, or it might have neighbors: one or more suns, worlds, moons, asteroids, comets, or other bodies. This neighborhood of celestial and planetary bodies is called a Wildspace system. The heavens and hells reside in Astral Domions that also exist within the Astral Sea. These are some of the known Wildspace Systems and Astral Dominions.
In Wildspace, the Material Plane and the Astral Plane overlap. Creatures and objects in Wildspace age normally and are effectively on both of those planes at once. If you were to leave your home world and continue outward until you neared the edge of your Wildspace system, you would begin to see a faint, silvery haze. By traveling into this haze, you pass from Wildspace into the Astral Sea, more colorfully known as the Silver Void. The deeper into the Astral Sea you travel, the thicker and brighter the haze becomes, but the stars that shine through it are always visible. Wildspace and the Astral Sea together comprise the Astral Plane.
The Astral Sea, like Wildspace, is a void; however, it is not an airless one. Here, you can breathe normally and exist indefinitely, never aging and never needing food or drink. You can propel yourself through the Astral Sea with the power of your mind alone, though many astral voyagers wisely travel in well-armed ships, for this place is the home of a host of fearsome creatures. Here travelers might find the petrified hulks of dead gods and swirling pools of color that serve as portals to other world and planes of existence.
The Astral Dominions exist within the Astral Sea and are subject to the same natural forces, or lack thereof.
Much in the way that oars and strong winds enable travel by sea on terrestrial worlds, magic items called spelljamming helms are used to propel and steer ships through Wildspace and the Astral Sea. A spelljamming helm customarily takes the form of an ornate chair in which the ship’s pilot sits. To attune to a spelljamming helm, one must be a spellcaster. The pilot of a spelljamming ship is called a spelljammer.
