Littlepip Enhanced Physiology

Life Bloom had magically purged me of taint, but I had been exposed to a lot of it, both through direct contact with the dirty I.M.P. lake in Maripony and later in trace aerosol amounts from the leak in the safe room. According to Life Bloom, all my internal organs were in the right places, and I hadn’t started to change size or grow wings, but the taint had altered me on a fundamental biological level. According to the unicorn, I was closer to being an alicorn than to being a pony.

Fallout Equestria Chapter 39
https://www.fimfiction.net/story/119190/41/fallout-equestria/chapter-thirty-nine-this-coming-storm