There's a plague infecting Equestria, and Diamond Tiara has taken it upon herself to cure it. They may be stronger in number and in sheer absurdity, but she's got a little something special to even the odds.
That something being a three-foot long magically enchanted samurai sword. Look, nobody said this was gonna be pretty.
(Written for the FIMFiction Writeoff Association's inaugural writeoff. The prompt was "Lonely Happiness". I got a bit creative with it.)