The Astral Sea floats above the world, an ocean of silvery liquid with the stars visible beneath the shallow sea. Sheets of shimmering starlight like gossamer veils part to reveal the dominions, the homes of the gods, like islands floating in the Astral Sea. Not all the gods live in dominions—the Raven Queen’s palace of Letherna stands in the Shadowfell, and Lolth’s home, the Demonweb Pits, is located in the Abyss. Avandra, Melora, and Torog wander the world, and both Sehanine and Vecna wander the whole cosmos.
Arvandor is a realm of natural beauty and arcane energy that echoes the Feywild. It’s the home of Corellon and sometimes of Sehanine. Arvandor seems to be as much a part of the Feywild as of the Astral Sea, and travelers claim to have reached it through both planes.
The Bright City of Hestavar, as its title suggests, is a vast metropolis where Erathis, Ioun, and Pelor make their homes. Powerful residents of all the planes make their way to the Bright City to buy and sell exotic goods.
The Iron Fortress of Chernoggar is Bane’s stronghold in the Astral Sea. As its name suggests, it’s a mighty stronghold of rust-pitted iron, said to be impregnable to attack. Even so, Gruumsh makes his home on an eternal battlefield outside the fortress’s walls, determined to raze it to the ground one day. Immortal warriors fight and die on both sides of this conflict, returning to life with every nightfall.
Celestia is the heavenly realm of Bahamut and Moradin. Kord also spends a good deal of time on its mountainous slopes because of an old friendship with the other gods, but his tempestuous nature keeps him from calling it home. Upon parting a veil to enter Celestia, a traveler arrives on the lower reaches of a great mountain. Behind him, the mountains disappear into silvery mist far below.
The Nine Hells is the home of Asmodeus and the devils. This plane is a dark, fiery world of continent-sized caverns ruled by warring princelings, though all are ultimately under the iron fist of Asmodeus.