Other planets can be seen circling in the night sky above. Sometimes, mighty archmages have visited them, bringing back tales of strange and fantastic places if they bother to tell about their exploits at all.
And sometimes, the inhabitants of these far-off worlds come to visit this one.
Magrith
A hot and wet world covered by dense jungles and deep oceans.Known inhabitants of this planet include carrion crawlers, chuuls, digesters, ethereal filchers, ettercaps, fungi, othyughs, phantom fungi, purple worms, shambling mounds, spider eaters, stirges, and tendriculous.
Rothea
The home world of humanity and many other intelligent races besides. Its geography and people are detailed elsewhere. Its solitary moon, Uluth, appears lifeless to the naked eye, but explorers who braved its airless surface tell of creatures of elemental earth who have made their home there. Some tales tell of vast underground cavern complexes with thriving ecosystems, but these reports must be considered apocryphal at bet.Also noteworthy are two large rocks with a length of approximately one hundred miles each that are located at the points where the gravitational pull of Rothea and Uluth cancel each other out. These are commonly called "Uluth's Herald" (or "the Herald") and "Uluth's Servant" (or "the Servant"), and appear approximately four hours before (in the case of the Herald) or after (in the case of the Servant) Uluth in the sky. Some diviners have reported seeing structures on the surface of these moonlets, pointing to inhabitants, but the truth behind this remains a mystery.
Yethrod
A wet world with a dense atmosphere, Yethrod is perpetually shrouded in mist. Yethrod has almost no natural elevations like mountains that break through its dense cloud cover. Instead, it has massive plants that are many miles high and that have been dubbed "world trees" by explorers, whose upper surface reaches beyond the clouds and hungrily drinks all the sunlight it can get. Its massive seeds float as well, thanks to lighter-than-air gases that accumulate in its interior. The seed trails a long root behind it that reaches all the way to the ground. When that root finds a locale that is suitable as a base for the world tree, it fixes itself to the ground and grows until it becomes the massive trunk of an adult world tree.Below its cloud cover, the atmosphere of Yethrod has a very low visibility. This has caused the animals of this planet to have underdeveloped visual organs - indeed, eyes are often entirely absent. On the other hand, they have a keenly developed sense of hearing, and most beings orientate themselves by sonar. Some beings have developed their sonar to such a strength that they can even rend flesh with it, and use it for hunting.
Know inhabitants of this planet include destrachans and yrthaks.
Surtus
A large, cool and dry world without any major bodies of water. Its wind-swept surface has a high content of iron, which gives the entire planet a rust red color.Bodenwald has established several diamond mines on Surtus, since these gems are abundant in some areas. The logistics of these mines are staggering, but they have paid off handsomely, since diamond dust is in strong demand as a material component for raise dead and similar spells. The mines now finance most of the space exploration ventures of the city-state, which has caused other cities to rethink their negligence of the other planets.
Known inhabitants of this planet include ankhegs, basilisks, behirs, bulettes, delvers, displacer beasts, frost worms, manticores, remorhazes, rust monsters, and umber hulks.
Calturus
The outermost planet in the solar system, Calturus presents a cold, airless surface to the observer. Its interior is still heated by volcanic activity, however, and all kinds of loathsome and slimy creatures thrive in the wet, subterranean cave systems.Known inhabitants of this planet include aboleths, cloakers, darkmantles, gray renders, gricks, mind flayers, and ropers.