The origin of humans.
Hundreds of thousands of years ago, Maeras had no Humans in it whatsoever. Their precursors, the Demons were instead inhabitants of the White Plane, where mana permeated all that existed. In this smooth, colorless world the Demons mastered magick to the point where they could open portals to different planes — though almost none that they found were remotely possible to live in. Until they found the “Blue Plane”.
It wasn’t named the Blue Plane until later; the Demons are colorblind. It was instead dubbed Ras Mnaa iira Ih’lasyid “the New Land of Demonkin”.
Eventually a new species of Demon evolved with darker skin, a bulkier figure and the ability to see color. Thus this new breed was name the Blue Plane Demon for the new land’s blue skies and seas that they could finally comprehend, and the senior breed the White Plane Demon for the pure white of the old land. From them came the Gemmans — A tall people with black and white skin — and the Dwarves — Stout, hardy and light skinned individuals who are inept at magick. These are the first Humans, the people that can claim the Blue Plane — Maeras — their home.