I really like this different take on the sorcerer. I feel it should be linked to some sort of codex though since there seems to be an entire world hiding behind it. Why would a prophet wish to exist in the material plane? Do their kind have long term plans there? What happens when the sorcerer dies?
A note - simple math states that Kandolari populations will dwindle - a female needs to have more than two viable offspring that reach maturity to maintain a population. If infant mortality, war and disease play a large role, this number rises steeply.
Browsing once more: hair grows out of follicles, not pores.
Also, I would not have mutant 'castes' - mutation through its very nature is random. So, the same mutants are unlikely, unless the variant is caused by dormant genes that are easily activated; or unless the mutant breeds true, giving rise to a branching-off sub-species.
With their elfin appearance and colorful hair, they also confer an anime feel - I don't know if that's intended.
This is quite excellent for a first submission. Besides Echo's remark on what should be a rapidly declining population (maybe change it to 4 offspring, 2 of which might be "norma"). Besides that, this needs little changing, methinks. Well done, and welcome to the Citadel!
I might be wrong on this account and am happy to be corrected, but I almost see this as 3+ different submissions that would do well to be linked together but each would probably stand well on their own.
The first, obviously, being the description of the magic and ether. That sub ended for me around where the description of the Sorcerer and The Choosing started up. With a tiny bit of work to separate them, that could be its own post and simply linked to from this one on the ether. Psionics would be the third that can be alluded to as another force available.
The only other critical critique is the mixture of things like diodes and cathodes as descriptors. While it makes perfect sense, if this is a dissertation of a living person during that time talking about diodes and sorcerers burned at the stake take me out of the sub. I may not know the rest of the world though and it might be appropriate.
All said I like the tone and voice and it is a very thorough description that I found quite complete. Nothing crazy cool or anything but it does a great job describing a rather abstract concept. Ether would prob get a 3.5 or so from me just because it is a great, solid sub.
Hope that helps! Great read!