we’re different!

FUN FACT, since Twilight has zero trustworthy magical training (since chaos magic works very different than harmony fundamentals and Celestia doesn’t know how to teach that) she mostly plays with science! and has a lot of fun and breakthroughs doing so!!!

sure! did this a bit ago,

in moments of high panic, as a filly, twilight could explode with an insane amount of magical power - enough to convert living organisms into other objects, effect gravity, and possibly time, depending on how one sees Spike's situation - in the draconequus au, this happened, but no one was around to help her stop the magical outpour.

initially, in an attempt to control the magical outpour, her body tried to convert her into an alicorn, as her magical output was great enough to trigger such a transformation - but it was doing more harm than good, and wasn't FAST enough. she was releasing too much magic too fast, and and it was searing her from marrow to fur.

in order to save her life, the magic itself converted her body into something that COULD handle that amount of dense energy all at once.

twilight doesn't really remember this process in detail. it happened relatively quickly - a matter of minutes - and the raw magic filling her head gave her a sort of amnesia for the major details of the incident, so the horror came from waking up in a new body, not the pain proceeding it.

Spike was left with Twilight because no one had any choice.

he REFUSED to leave her even as an infant, and baby or not, dragons are pretty dangerous - especially one with Twilight's magic infused into it.

he has a little of her magic he can still access, too! this will grow over time, but essentially Spike and Twilight are linked magically and he's got more oomph than the average dragon.

once he was more grown and sentient, he was the one to suggest going out to do errands for Twilight while she was under quarantine. he's very proud of her and loves her with all his little heart.

Celestia wanted to take him from Twilight once he was properly grown and capable of communication, but Spike made sure to tell her that wasn't happening under any circumstance. Twilight's his family as far as he's concerned.