After the defeat of Nightmare Moon the thestrals were scattered to the most remote corners of the world In deep caves and forgotten mountains they lived, isolated from the outside world. As a thousand years past the rest of the world forgot them, and the thestrals grew stagnant in their isolation.
As the outside world grows and expands, their once isolated homes become less remote. As outside forces begin to invade, one thestral is forced from her home to seek aid and reunite the fragmented thestral clans on the eve of Nightmare Moon's return.
Takes place a few months before episode 1.
Chapters 1-3 edited by SweetieBotError