Terra was the 'third sister' of the alicorn princesses: Celestia and Luna, and was also the middle child since she was older than Luna, but younger than Celestia. Terra is the princess who built Equestria by controlling the elements: earth, water, and air, albeit she was never mentioned in history books, nor by Celestia and Luna themselves due to their paranoia of their sister being a danger to Equestria rather than keeping the land in balance with them. This paranoia came from a past event where Terra, feeling as if she was 'not as important as Celestia and Luna', begins destroying Equestria in rage. This was suppressed by Celestia and Luna. So Terra, allying with Discord the god of chaos, vows to seek revenge on Equestria and her sisters respectively. She places a spell on her own newly born foal which places a 'dormant' version of Terra inside of the foal's conscience as well as making the foal gradually age as an added bonus. This foal has unbelievably incredible magic, which she can not fully control yet. When manipulated by Discord, and the dormant conscience of Terra awakened, this foal may result as even more of a threat to Equestria than Terra ever was..
Interesting story, I like it, but the first part of the story was a little hard to follow, you maybe should have broken it down to smaller segment's, it's easier for the eyes, Terra seems a little over powered and made the same mistakes as luna, which she should have learned if you ask me, but I'm just saying. This story has some potential and such, I'd give it about a 7 1/2 out of 10. There were a few grammar errors (you're actually supposed to double space at the beginning of each sentence but heck no pony know's that), but over all good job on the grammar and spelling.
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Yeah this chapter was actually written by me and a friend in 2011, but thanks for the positive feedback. I might edit the prologue if I get around to it.
A few things were worded weirdly, but other then that, it has potential.