When I was in a very Brandon Sanderson phase of my life, I created a nameless setting that I wrote a few works in. Originally, it would have spanned the whole universe, but the only two things I wrote were on the same planet, Flers.

(From a comment on another blog post)

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So uh the magic system...

I never actually came up with concrete laws. But it revolves around gemstones and heat. Different gemstones have different abilities and stuff, the main two showing up in the novellas I wrote were A: Creating an inter-dimensional gateway to a hellish world of incomprehensible beings (various diamonds) and B: Controlling/being controlled by said incomprehensible beings (amethyst). And then they can also store information, and the Syndicate has pretty much supercomputers and magitech stuff going on. And then teleportation is a thing as well.

 

Anyway, I'll just dump setting information, and mention what I like at the end.

So, initially, humanity is just on the planet Flers, on an island continent in the south. A group who has basically monopolized the magic system is taking over, and plans a grand ritual thing that will genocide everyone not a part of them. However, a man named Xeflerx sabotages the ritual, causing it instead to teleport them all away to a safe place instead. He ends up on a new continent to the north, where he founds the kingdom of Xefleara. This ends up sending a large number of the refugees to other habitable planets as well, as the spell would "take them to a safe place" without distance necessarily being a factor.

A group of these refugees create "The Syndicate of the Great Gem", a space-faring organization that takes over a large number of planets, and have very advanced magitech stuff. They are led by the "Supreme General", a man who has had his lifespan increased thanks to implants of gemstone, and he aims for the "Great Gem", a gemstone that will supposedly grant greater power than all others. (This gemstone, as it turns out, is citrine, and it's power is to control other gemstones)

Meanwhile in Xefleara, over a thousand years later, a couple create a gateway to another dimension of beings that consume heat, and the husband ends up mind-controlled by them, who use him to take over the kingdom. These beings, known as the wraiths, prefer consuming the heat of humans, and so institute a system where criminals are thrown to them. They are unable to leave a certain radius most of the time, because sunlight and moonlight destroys them if they go too far away from their portal. At the end of my novella, one of the protagonists manages to take control of the wraiths from the king, and begins planning to take back the kingdom.

Anyway I like the Syndicate. I didn't talk much about them, but they have some cool aesthetics, and I like looking at the humans in super huge powerful organizations.