An old man, recently deceased is reborn as the pony Saving Blade. His past is a fragmented blur that bestows him skills in the field of combat, deception and assassination. Using his abilities, he serves Celestia in a way that hasn't been done in many centuries: to find and kill enemies that hide within the crowds of Equestria, specifically Canterlot. He finds that they are many indeed.

He also finds secrets that he already knew about.
And friends that help in this fight that he had already lost.
And joining a brotherhood that he has already joined.

But why not use the Elements of Harmony? The first reason is that these enemies are so dug in deep that they might be your friends, your enemies or even your brother or sister. They need someone who believes nothing is true and everything is permitted in the fight against these beings.

Why not the royal guards that number in the hundreds? Even they are not safe from contamination and conversion. Though they stay their hooves from the blood of innocents, there are more ways to harm one another.

Why can't Princess Celestia or Luna bucking usE their hayload of magic energy to trap and zap 'em? 'Cause then I'd writing that fic instead of this one.

*If you came here for pony, be joyous for this story if full of it. Some human scenes but only small and not that important.*