Alien dimensions as source of fantasy magic? it's an old idea but it checks out
Sorq was originally a metal rich, dense moon. Planetary engineering transformed it into a world-vehicle for the evacuation of a civilization from a doomed star. That star is now a white dwarf; Sorq moved to its primary’s companion, a star now in itself evolving, red and swollen. The world can move about, create vast force fields, manipulate spacetime and other fundamental forces in its vicinity. The original inhabitants and world-shapers changed out of their old forms over the course of more than a billion years. Interstellar species have come and gone, some taking an interest in the curious world, between the size of Mercury and Mars but with surface gravity close to old Earth. At some point new arrivals crafted a lithosphere around the old surface, fitting planetoids and cometary mass together in imitation of a planetary surface with water and atmosphere. So it was when humans and allied sophonts came across Sorq, studied it, settled it, brought along many pets and treasures. [I do k...