We all have sin in us somewhere.
A long-forgotten supernal evil is released, a force capable of warping space, shattering minds, and overthrowing kings, and it will stop at nothing to claim its rightful spot as ruler of Equestria, and the world at large.
The Elements of Harmony would be the natural solution, to shove this eldritch horror under the rug with a flash of light; but this new enemy has come prepared, and has recruited a handful of unwilling minions to aid him in disassembling their comfortable and precious harmony from within: the Elements themselves.

This story will be comprised primarily of seven acts, each focusing on a different character and mostly on different events. Additionally, there are a few intermittent chapters which tie the acts together.
Information will be added below as it comes, so as to avoid premature spoilers.
Superbia. Don't take it too seriously. [Slice of Life. Rainbow Dash loses a race.]
Avaritia. Finder's, keeper's.
Luxuria. Thriving on attention.
Invidia. The grass is always greener.
Gula. It comes naturally.
Ira. Curiosity killed the cat.
Acedia. Why bother?

Cover image is from a free online Mystic Rose generator and edited by me. Subject to change, just like everything else that ever was or will be.