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..