Derpy is sick of pretending to be somepony she isn't. All she wants is to be left alone, to have a peaceful life with somepony she cares about.
When she catches the interest of the Outsider, a mysterious deity most often described as "part angel, part devil, and entirely ambiguous," she replaces one mask with another, and learns exactly how far a pony is willing to go to do the right thing- and how powerful the lure of power can be.
The question isn't whether she'll survive or not- the question is whether she'll follow the path of mercy, or revel in the carnage her newfound powers will allow her to sew.

This is a tale of plague, betrayal, vengeance, justice, and, perhaps most importantly, muffins.

Cancelled due to lack of interest- on my part as well as you guys'.