I saw your fanwalker post mention a fan plane called Moloni, what is it all about? :). (This is @leafdrake-haven )
Moloni is a plane where magic isn't as readily available as most. Between the plane's core and leylines and the surface, there's a layer of nullstone that stops magic from reaching except through specific spots and cracks.
Those create Sources on the surface, powerful (or more minor) fonts of magic that allow magic to be used within its range (by default). Most are associated with a single color but some can have more.
From each Source tends to emerge a Guardian, an Iconic of matching color that is tied to that Source, lives from it and controls its access. They'll be an Angel for a white Source, a Sphinx for blue, a Demon for black, a Dragon for red and an Elemental for green (not a hydra because harder to make sapient, though most elemental guardians take a hydra-like shape by default). All sources but one have a single Guardian, even if they have more than one color, it might be either of the iconics but embodying both.
A Guardian controls the magic of their Source, and how it can be used. They can allow or refuse the use of magic within its range to anyone they wish. How that is used vary from Guardian to Guardian, but most countries have a default way to do things their Guardians agree to.
A very common thing is for Guardians to choose a mortal to grant a particular tie to their Source, sharing and delegating some of their power to them, and making them ruler within the range of their Source.
Due to access to magic being able to be allowed to one side (there's some work arounds, but they're nowhere as practical), defense on the plane is much easier than offense, which led to a lot of independent city-states managing to survive, but there's still a few larger countries or alliances that managed to form.
Due to its limited access to magic, the plane is hard to pinpoint and planeswalk to if you don't know what you're looking for. Planeswalkers have the huge advantage of being able to draw mana from off-plane though, so it's a good thing they are even more unlikely to be found there.
Of my characters, Hadissen is from there. It was Icalia's first planeswalk a few centuries ago. She temporarily became a Source's Guardian then as an oldwalker, but her Source has a new Guardian now, they're in good terms. Icalia is still connected to it.
