I'm my "Beastroots" setting, dwarves, gnomes, and elves are banned.
Why?
Because the point of the setting is that the gods are animal spirits and the only races are men, men divinely blessed to be part beast (half man half animal), and men divinely altered to be halfling (half man half nothing or goliath (half man, half man half man).
Someone who asks to be a dwarf be be asked in return "which animal is a dwarf half of?"
If they come up with a good answer, they get to be a dwarf.
If they come up with an animal that already has a god and beastfolk, too bad.
If they can't come up with a good dwarf animal, the world stays dwarfless.