The Summer Apprentice (The First Season of Elsewhen)
Humans newly come to the World of Amedia were astonished to learn that the planet was sentient. They were devastated when that sentience declared the air, which seemed so fresh and wonderful, to be far too rich in the element oxygen for those technologies on which humans relied to be safe.
Technology, Amedia told them, was forbidden.
The World did offer an alternative: A genetic condition existed in a small portion of the newly arrived population that would allow them access to unique fields of power naturally generated by Amedia. This power could provide an interim solution for many of the needs that their technology had filled.
The people would come to call this power Magic.