With the new Arcanum we have new teachers for all schools, including a new Astral teacher we've yet to see in game. But they should definitely teach some spells closer to the actual things the schools represent. For , there are 7 types of stars in the MK classification, which would be perfect for the 7 main schools. They are as follows:
O - Very hot and luminous, almost ultraviolet blue, rare and often massive. B - Very luminous, blue, short-lived, often brightest and some massive. A - Faintly blue-white, quite luminous. F - Yellow-white, small. G - Yellow, unstable, expands into a red giant. K - Slightly cooler than normal, orange, stable. M - Very common, low luminosity and temperature (for stars), red dwarfs/giants/supergiants.
So what schools share a great resemblance? Not many. I think that G would fit with quite well as both are quite unstable and G-stars die very quickly and with a lot of heat. K would likely fit , with the orange colour and stability, being somewhat cooler than but warmer than... Even though these stars are red, with the lowest temperature and being opposite around ; M has to be . On the opposite end of the scale, O would fit well as , with the ultraviolet side being largely unknown, like Necromancy's mysteries, and also the rarity but power of them (*cough* Morganthe *cough*) match up. Right next to it with the very bright B-stars would probably be ; both are very bright and energetic, and not many schools fit that. Then, A-stars are either or . As A-stars are brighter than F-stars and A are bluish while F are yellowish; A should be and F should be . So then:
O - . +28% damage, +10 crit & double stolen. B - . +24% damage, +20 crit & double inc & out . A - . +20% damage, +30 crit & +40% of positive charm % on self. (+40% to +56%) F - . +16% damage, +40 crit & +40% of positive ward % on self. (-50% to -70%) G - . +12% damage, +50 crit & +15% pierce. K - . +8% damage, +60 crit & +10% to all stats. M - . +4% damage, +70 crit & +15% defence.
But what would they do? Heat, luminosity and size seem to be common factors with these stars. So let's call heat a unique stat to each aura, luminosity could be damage & size could be damage. Naturally, I filled these stats in. Each of these should cost 1 or 2 pips but have no backlash. Some of the third abilities may seem -worthy, but if you look closely at these and then the shadow spells, they're not quite as powerful. I think the names should be something along the lines of O-Star Glow, B-Star Glow, et cetera. Or something along those lines. And, of course, we haven't even reached or yet.