(Yes, I have gotten permission from Aegis Shield)

It has been a year since Twilight gave birth to a healthy foal, who she and her husband Spartan Shield have named Gleaming Shield. As the new Princess and mother cares for her foal, and the father works as a trainer for the Royal, and reluctantly, the Night Guard, alongside his descendant Aegis Shield, dark forces conspire against the family, wishing to utilize the innate power of the foal to fulfill an ancient prophecy, and resurrect the greatest tyrant to ever reign on Equiss.....

(Unofficial sequel to Aegis Shield's Twilight Sparkle and the Spartan Stallion, which I highly recommend)