Who are you, when you cannot be yourself? Can you save Equestria anyway, even if it has already fallen?

Under the tyrannical regime of Queen Radiance and her Nobles, Stable 69 is an okay place to live for those in charge. But for their shock-collared slaves, life in Stable 69 means getting fucked over by those in charge. One of many shelters intended to house Equestria's population was subjected to an experiment: Unleashing a potion-based mutagen to transform every pony it touched into another random animal that had practically gone extinct outside the shelter's walls. Nopony was spared transformation, not even those in charge of the experiment. Only the rare few mysteriously immune to the mutagen retained their Equinity. But when the Nobles took over with the aid of dumb panicky animals created by this great and terrible experiment, the nightmare began, and now somepony's got to end it.

Despite his wits and might and "stunning good looks"(if you don't mind his kind), Sparky never thought he was anything special. Just another half-Unicorn Lion working two jobs to support himself and his adopted sibling, an autistic Wolf girl by the "creative" name of Luna. He never thought he'd amount to anything in this society of lies, not with a slave collar around his neck that could kill him if he ever stopped working.

And then he was gifted a mysterious journal with a drawing of an Apple on the cover.

When a certain lavender Unicorn with eyes of amethyst and stars on her rear invited Sparky to The Church Of Dawn's Hope, his life was changed forever, thrusting him hard and fast and far too deep into a world of chaos and madness with Twilight Sparkle herself at his side in an everlasting war for Equestria's past, present, and future.

Because war...

War never changes.

Contains death. Ratings disabled because I prefer comments.