Ironsworn is a free to play, fairly light role playing game about people in the early middle ages in a harsh and cold land. It's designed for collaborative, GMless play and on-the-fly worldbuilding. Would anyone be interested in playing?
What about distinct "Evil" and "Good" variants of mind manipulation? Also, what if there is some "super-magic" that is more powerful, but more difficult/more costly/forgotten?
There are a few possibilities: It is some naturally occuring magical mineral; it is the site of an apotheosis; it was raised by an institution (a state, magical society, guild, race, or religion) that still occupies it; it was raised by a long dead institution, and now inhabited by someone else.
I think that, throughout history, races should be a mix of humanoid and not, so it's not too intimidating to the reader/player/writer/whomever will be using the world after us.