Yethrod
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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. Most species are highly mobile and often migratory, and a high percentage of the native animals are airborne. Plants tend to scatter wind-borne seeds which spread far and wide. Some of these seeds can be very dangerous, as they lodge in the lungs of animals who inhale them and grow until they kill their hosts (though some variants keep their hosts alive and continue to feed on them in a parasitic relationship - even controlling their behavior in some cases). Human explorers dread this "disease", which they call green lung.

An explanation for the dominance of migratory species might be that according to archeological research, the poles of the planet shifted by 47 degrees in 1093 NA, causing wide-spread climate changes and devastation. There are some hints that this event was not a singular occurrence in the history of Yethrod, and members of the Astromantic Society are investigating this issue as some worry that such an event might happen on other planets - including Rothea - as well.

List of Yethrodian Flora and Fauna

List of Yethrod Locations

Adventure Ideas

Designer's Notes & Resources

Urbis has a lot of symmetries and parallels to our own world. But now and then I like to break those symmetries to keep everyone on their toes, and to provide something fresh and novel.

Yethrod is an example of such a broken symmetry. While most planets in the solar system of Rothea have equivalents in the solar system of Earth, Yethod doesn't - it is located between the Earth-equivalent (Rothea) and the Mars-equivalent (Surtus).

Furthermore, the fact that it has a denser cloud cover than Rothea - which is closer to the sun, and thus should have higher water condensation - begs for an explanation. It would probably be an interesting exercise in figuring out the way the ecosystem of Yethrod works, especially considering the general blindness of its inhabitants. As usual, feel free to add your own ideas as non-canon text.

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