A lone Korpsman is sent to wipe out Equestria, but first he must dig a trench. And dig...and dig...and dig. Destroying Equestria is going to take a while.
Twilight has a bit of a problem. You see, she always does Princess Celestia's bidding, regardless of how ridiculous or insane the task. Now, it'd be just a shame if someone were to abuse this knowledge to their own malicious ends...