A planet of Zimlja in the system of Tritaris, where ponies were peacefully living as well with other mythical creatures and normal life forms like dragons, griffons, bunnies,...
Zimlja was actually the ancient Equestria, the ponies and other life froms were created by the single omnipotent Maker in the entire universe. Through many evolving ages, ponies and other creatures have live their happily life although they are still too primitive and uncivilized.
Until a day, when a secret organization of reapers discovered the planet as the mine for their soul reaping in order to ease their hunger and preserve their power. The planet immediately shrunk into infinite terror and hatred as wars constantly ravaging the planet. Reapers laughing on the bounty of souls, they earned from their wickedness works; until that day comes.
A day changes the fate of the ponies and universe forever......