This was a short manifestation of my interest to constructed languages.

And now I want to write something frpg and fantasy related.

Before I've found this forum, I had been making up settings for my (never to be created) fantasy forums. This interests me more than role playing. My former idea was the "water world".

My genre is fantasy, with elves and demons, original worlds, so while making my own world I stay in this paradigm. Among original fantasy forums which I have seen, there is a common structure of describing worlds. There is a "library" section and there are "races", "geography", "magic", "gods", "history" topics. So I think up these sides of the world when I usually construct new setting, and so I expected to construct it that time, but it went another way.

So, the "water world".

Races. There are different races like elves, dragons, demons, fairies, undeads, werewolves, centauruses, walking trees, living ice lumps, and whatever else is actual in fantasy. There are humanoid races, like dwarves, drows or greenskin orcs. There are humanoid creatures, that are very small, like lilliputs or Thumbelina, and creatures, that are very big, like some dark souls bosses or Eren Yeager. There are speaking animals, living mechanisms, and creatures that incarnate some elements, like fire, lightning, or the greatest blackness of university.
But the main playable race are water elementals, which are able to morph into any living creature they want. For all the living in this world came from water and mostly consist of water. Plants, animals, humans and humanoids, tiny creatures which are not seen by humans eyes and huge creatures which are more like mountains than living creatures. Every life that has some blood inside.
"Morphing into any living creature" means, that they can replicate abilities too, not only outside. That means, if water elemental morphs into a creature which reproduces by breeding, it can breed with the same creature and procreate offsprings. And that means, if morphling is slightly different from the original creature, different color of skin or different shape of ears, the breed of original creature and morphling would inherit these differences too. That is why so many humanoids with any colors and any shapes exist. And that is why there are so many creatures which are evolutionary unreasonable, like human-like creatures but ant size. That's just like a god's will, but only godlike water creatures with powers over life substance.
"Morphing" also means, that morphling can replicate biological necessities and processes with their restrictions, like hunger, illnesses, aging. Morphling can live like living and mortal, eat, sleep, be ill, recover, become old. Morphling can live as a human for decades and then die like mortal, and then become water again, as it has always been and never stopped being. Morphling can do that not only because it wants to live mortal life, but also because when becoming human deep inside, it forgets he/she once was immortal and eternal water. He/she could remember once, or can live mortal life until dies. And then remembers.
All the living creatures were morphlings in the past or have morphlings ancestry. What is the difference between morphling and not-morphling then? For morphling, there is no difference at all, exept that not-morphlings don't remember they are morphlings in real, and they've forgotten how to morph, subjecting to natural processes of their organisms without being able to control them. Every life comes from water before birth and returns to water after death. So after death, every life remembers it's true immortal nature.
Water elementals are as ancient as water. Many of them remember the world's creation. Many of them also remember themselves before having "selves", but being one great ocean. Those water elementals who morphs into mortal creatures like humans are only tiny drops in this world ocean.

History. Long ago the world was firing stone, with no any water, no any air and no any life. Then stars flew from far space and crashed the ground. These stars were made of ice. So when they reached the firing world, they melted to water, and the world stifled and calmed.
Most of the surface of the world became water, but there was earth as well, and it was changing. Isles drowned and rose, moved and changed form constantly. Life arose in the ocean, it was tiny and then grew big, some of it floated up to surface of water, and sunlight made it green. This green breathed, and breathed out live air that hadn't existed before. Over time, this air filled the sky and made it blue.
Billions years passed since ice stars came to world, and the world changed a lot. Changes never stopped. Earth, water and life took different forums. Once they took form of continents and isles of definite shape, and in definite period of time these lands were inhabited by certain species with certain features and lifetimes. Some of them even created culture. That was not forever. Species appears and fade away every thousand year, some of them last ten thousands years, or hundred thousands. For stars, neither is long.

Geography. The world consists from lands, waters, and the sky. The sky is usually blue, the sun is usually yellow, and the moon is usually sole. But these rules are not strictly stable.
As the world consists, besides sky, from waters and lands, the world consists also from sides. As the sides lay between lands and waters. The side can be a seashore, or it can be a sandy beach, or it can be the East coast, or the West coast, or a coast as western that it becomes eastern, or the opposite.
Some coasts of the world are strange coasts. As the land is surrounded by water, while water is surrounded by land, the border is usually closed. That means, if one moves along the coast, he rounds it eventually and returns to the same point he started. Some land is small, one may round it fast. Some land is huge, with a compound form, its coast lasts very long, and one may spend years to round it. The lenght of coast depends on the size of land or water. For this is how lands and waters work. But some coasts work otherwise. Or maybe it is just an ability of those who move.
If one will move along the coast, he'll never come to the same place. Because one moves along the coast not as along the circle, therefore not in cycle. Along the coast, one moves like along the line, which lays different from the lands shape. So the land as well can be different. Also waters, and the sky. That is why the sky is usually blue, the sun is usually yellow, and the moon is usually sole, but not strictly. One day you walk along the coast until sunset, and if you continue walking in the same direction for all the night till dawn, the new sunset might be not red that turns to yellow, but magenta that turnes to green, and then there'd be two moons.

This is a setting I've imagined. I haven't imagined further, I wanted to think up something with evil demons as invaders and world destroyers, and they are like corrupt water, and their own bodies are not consist from water, and there is some conflict of good and evil.