My story with Cynder the Dragon avoided all these problems by getting reborn and living from day one from age zero.
Learning from experience about body, learning common knowledge and common sense of the world she lifes in.
She is a protégé instead of a adult retard having invested time and effort into every year of her life.

Now she reached school age, had a ton of character development and isn't even 10 years old yet... in time I reach adulthood that character is a well developed individual.
Something unfortunately that seem to be missing with Rose Tint. Poor stallion.

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I'm not sure why you keep saying this. I understood you the first through fourth times

I'm glad to see you're still reading, though!

Once this symptom manifests, permanent damage to the afflicted areas will occur, which can lead to inhibition of motor skills and language, erratic changes in behavior, death, and/or acute spontaneous detonation.

Now I know it's bad, but that last one made me chuckle

I was confused when I finished chapter 6 of the rewrite and tried going to the next chapter but you seem to have put chapter 1 where chapter 7 should be?

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There is no chapter seven of the rewrite (yet), that is the old fic, I will be archiving it once the new fic reaches about 50k words or so probably.

Well, perhaps he didn't receive brain damage by not doing magic, but I am almost certain he earned himself at least a little bit by doing magic. I heard the dosage makes the poison, but Rose here invented the negative dosage spectrum all by himself. All in all a W in my eyes.

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Yeah, spell backfire is no joke; that was just with a simple levitation spell while swinging a mid-sized book around. Imagine if he got bonked while doing something bigger!

I settle in and pour over the first few chapters of A Pony Guide to Growing Up , checking the table of contents for anything that strikes me as immediately relevant.

"pore over"

Not only did this turn out to be an excellent idea, but the material is quite fascinating. According to the er…what I am assuming are simplified explanations meant for a younger audience, most creatures that utilize magic as a significant part of their survival strategy have a Thaumic System, which allows them to absorb magic from their environment and diet, as well as distribute that magic to the parts of their body which require it to serve their functions, serving as a sort of secondary circulatory system which transfers a substance serving as a sort of biological store for magical energy throughout the body.

I sink into a pleasant, almost meditative state as I do so. After a while, I begin to feel a faint ebb and flow within myself. I can hear the beating of my heart, familiar enough on its own. Alongside it, I can feel something else. On the opposite side of my chest, a second, independent beating rhythm, accompanied by an ever so tingly, warm sensation that attaches itself to the ebb and flow I felt before. It must be the organ that pumps the ichor through my body.

Quoting from a different story...

That pulsing center you no doubt noticed is called a carbuncle. It’s a common misnomer to associate it with the heart, but I would be remiss if I did not acknowledge the sentiment does have some merit. While it is true both the heart and carbuncle keeps the blood/mana flowing; the primary difference is that the carbuncle is your fount of magic, whereas the heart is just a complex pump. It is there that your body, regardless of tribe, generates and distributes magic. However like the heart, it can be considered a muscle in light of the fact that it can be exercised to become stronger. Again like a muscle, you must use your magic to increase it. It lends credence to the old adage: “you have to spend bits to make bits”.

Do I detect some Wheel of Time influence on the magic system you’ve devised? Spinning threads of Fire and Spirit Aether is so familiar…

Aside from that, his aura being hot pink instead of a shade of blurple to match his eyes was a bit of a surprise.

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Sure is! Gotta pay respects to my GOAT! 🙏

Fun fact though! Spellcasting is only one of three aspects of magic which all operate on their own rulesets that interact with each other ^^

And yea, that sure is a neat detail huh? :3

More severe long-term symptoms include the crystallization of the shed magical energy in the most heavily afflicted parts of the body, which are the horn and brain. Once this symptom manifests, permanent damage to the afflicted areas will occur, which can lead to inhibition of motor skills and language, erratic changes in behavior, death, and/or acute spontaneous detonation.

Are you saying, if a unicorn goes waaay too long without using magic, their head might just explode? (Like at the end of the Kingsman movie?)

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^YES