The setting, aka Gristhaia itself

The only thing set in stone about the mega-continent of Gristhaia is its name. Everything else varies wildly depending on where you are in the land. There are mountains, oceans, rivers and lakes. One can basically find any sort of geographical feature, as long as you know where to look for it.

TL;DR- Write and do what you want, just explain it and don't completely break the suspension of belief beyond repair.

The peoples are just as varied. There are elves, dwarves, orcs, and humans, but that's just the start. Animation magic has given several constructs sentience, where before they were simple animated objects without a conscious mind, races such as the warforged are evidence of that. Basically any race that your mind can dream up, can be present in Gristhaia.

Cities, towns, villages, hamlets, thorpes, they are all present here. Some nations are massive, with high towers that some would even call skyscrapers, made of forged adamantine parts, while other nations may be only just developing clay or ceramic roof tiles for their 1 or 2 story buildings. Meanwhile, there might be a nomadic tribe with self-erecting tents and cabins that find themselves at war with a city whose technology has not evolved past sun-dried clay brick walls. The civilizations in Gristhaia vary wildly, and they are certainly not uniform in nature.

Don't let certain biological rules prevent you from creating creatures. Otherwise Colossal size ancient dragons couldn't exist, let alone fly, due to surface area to volume ratios.The worst you could do, is say "BECAUSE IT'S MAGIC MOTHERFUCKERS" and even then, that is acceptable in certain circumstances. Things like the tensile strength of dragon scales being akin to metallic compounds/alloys, and bone density/strength being significantly stronger are just fine. Feel free to compare magical components to mundane, real world materials, but also feel free to exceed the limitations as long if you have a special material/component/body part that you want to write.

If you'd like to start a new continent, please just consult with me, and we can certainly work something out.