Well, now that I've given a bit more of a background to the Deols in charge of my little world in the "Mind of the Deols" posts, I'll explain the magic system in relation to the Deols as well. Each of the four created Deols has an affiliation for one of the four fundamental forces. This isn't established when they are created, but rather, when the laws for the ways the material plane operates are devised. When it is decided that four forms of energy out of all the numerous classes of energy will be used to design the physical universe, each of the Deols adopts a force as their own personal domain. Electromagnetism belongs to Ällora.
This force is the easiest to conceive uses for, since we already employ it so prevalently. I believe that it's most basic uses will be heating, lifting and illumination. They're the most straightforward ways to use EM, like splashes of paint on a canvas by a 5 year old.
As a user's understanding of electromagnetism improves, the possibilities broaden. From the electric side of the force, any device runs on electricity is theoretically possible. Cameras, calculators, laptops, phones, clocks, and so on. Since I've said that magic would be something like exercise for the soul, I would imagine that a culture using electromagnetism would also try and automate as many functions as possible. Otherwise using a computer could possibly be unduly tiring. So perhaps they have batteries to charge so they can take their minds off keeping a device running. Similar to a crank that you would wind up and then release to run a clock. But of course they wouldn't really require an electric grid, the potential difference could be established directly within the device.
On the magnetic facet of the force, access to levitation would easily lead to the development of maglev based transport systems. Once again, I suspect these would eventually be automated rather than tediously controlled by micromanagement. In my understanding of things, there is no reason why magic has to remain a manual, unpredictable thing. If people had reliable access to magic, as they do within my fantasy, they would develop suitably advanced technologies to exploit such magic. Magnetism could also be used to build navigational devices, using the magnetic field of the planet.
A final expression of the electromagnetic force is that of electromagnetic waves, a fusion of electricity and magnetism, light. From the radio to the gamma, uses for electromagnetic waves could be as varied as they are today. I do want to impose a limiter that x-rays and gamma rays, being of higher energies and frequencies, necessarily require more energy on the mage's part to generate. Internal heating or cooling would be a simple exercise, as with lighting.
Additionally, based on optics, a direct manipulation of light would also allow for magnification. Directly, without the aid of lenses. Mages with the electromagnetic force under their command would discover tissues, cells, organelles and microorganisms. They could possibly observe them while they were alive, allowing functional elucidation much more easily as well.
Based on all this, it is certainly possible that a group of mages using the electromagnetic force could create a technological system comparable to what we have today, or even move beyond it. The internet, wireless communication, maglev trains, automated climate control and computing for example.
More traditionally magical uses exist for a mental command of electromagnetism of course, that may not be easily achievable with today's standards of technology. Cloaking devices, flight, precise nano-engineering, phasing objects through barriers, seeing through walls, just to name a few uses.
To end off, given what we can already achieve with just one of the four fundamental forces, electromagnetism, it's rather interesting to consider what humanity would be able to achieve if we could somehow control gravity, the strong interaction and weak interaction to a simliar degree. Of course, it's also rather interesting to note that electromagnetism has such a dominant role in our lives, I'm tying this into my story, but I won't reveal how or why just yet, but there have been hints at it all the same.
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