Beyond the circles of the mortal world lies
an expanse of infinite possibility. The Astral Sea is
a great silvery void in which countless fragments of
divine or mortal purpose drift—dreams, ideas, and
wishes, as well as fears and dark desires. All these
thoughts and feelings become real and physical in
this place. Most are virtually unnoticeable, of course.
An ordinary mortal’s passing fancy vanishes in the
Astral Sea like a single raindrop falling into a mighty
ocean. But dreams and dreads with power are a different
matter. The desires of deities or beliefs shared
by thousands of mortals take shape as vast kingdoms
or even whole worlds within the Astral Sea.
These kingdoms and worlds are the astral dominions—
planes adrift within the fundamental expanse
of the Astral Sea. Some are heavenly realms of peace
and splendor. Some are fantastic dreamscapes filled
with marvels and strange perils. And some are dark
and tormented places, hellish domains filled with
unspeakable evil. Of all the planes, with the exception
of the Far Realm, the dominions of the Astral Sea
are the most remote from the mortal world. Only the
mightiest of heroes venture here.
Most sites of interest in the Astral Sea lie inside the
borders of the astral dominions. Countless gates,
portals, or conduits link the material world with the
various astral dominions, so most travelers bypass the
astral plane by teleporting directly to their destination.
However, adventurers sometimes can’t find a
portal leading to the dominion they seek, or come up
against quests that require them to search out some
specific locale in the Astral Sea itself—for example,
a lost githyanki stronghold. When no portal can be
found, travelers must venture into the limitless Astral
Sea and navigate their way to their goal.