The planetary core of Aeneor emanates a unique force which was termed μ by initial human pioneers arriving on the planet.
Every living creature on the planet is highly attuned to μ, with special physiology optimized to detect and manipulate it.
Current humans call this force and the ability to manipulate it 'magic'. Humans have evolved no innate ability to detect or perform magic, and thus have developed a wide variety of magical tools and instruments. The operation of such instruments is extremely complicated and can only be learned through years of education and practice. Humans in Solis have established multiple schools for magic, including The Royal Colleg and Bris Academy.