If you don't like alicorn OC's, just give this a chance. This fanfiction explores the idea of Celestia having a daughter who wants to know her purpose in life while an ancient threat returns and something just as evil from within wants control

Princess Amity has lived in Canterlot all of her life and loves her mother Princess Celestia more than any other pony in the world. However, she does not know her purpose in life, but Celestia ensures that Amity will accomplish wonders.

Princess Amity daughter of Celestia has lived in Canterlot all of her life and has loved every moment of it, but she is upset for not achieving anything like her mother. However, Celestia has always said destiny will reward her when the time comes.

Cadence is asked to help the newest inmate of the Canterlot Asylum. However, what the inmate tells her, is shocking.