My Little Pony: Friendship is Magic; The Seventh Element of Harmony

This story takes place in the wonderful world of Equestria, where everypony lives in peace and harmony. Somewhere in Equestria a long time ago stood a village called Horn Mountain Village where a young Filly named Eclipso lived, along with his older sister and brother and adoptive parents. His sister's name was Sunstone and his brother's name was Moondrop. Their adoptive mother's name was Moonbeam and their adoptive father's name was Sunbeam. Their real parents were unknown since they were babies, but legends say that their real mother was Gusty the Great, the legendary Unicorn who led a bunch of warriors to defeat the villainous Grogar! Legends also say that their real father was the evil Unicorn named Sambra, who got consumed by shadows and cursed the Crystal Empire! After Grogar's defeat, Gusty and Sambra thought that the only way to protect their children was to give them away to another Pony couple to raise and protect them. What future lies ahead for Eclipso, Sunstone and Moondrop?