Twilight Sparkle and her friends fought valiantly in The Battle of The Canterlot Wedding, but they could not save everypony. One such victim was Nebula, a stallion who watched helplessly as his parents were literally drained of emotion by an invading swarm of changelings. Sadly, neither party recovered: Nebula’s parents were trapped in a catatonic state following the attack, while Nebula himself was convinced that Princess Celestia was to blame for the loss of his parents.
 
She’s weak, Nebula reasoned. Celestia is convinced that monsters can be tamed, and trusted with the safety of our people. She allied herself with Discord, an all-powerful abomination of nature who has thrice attempted to bring chaos and destruction to our nation! She can’t even fight her own battles… she sends her precious purple student to save the day in her stead while the rest of us suffer! Well, no more! I’m going to bring peace to my nation if it’s the last thing I do!
 
Nebula spent every waking hour studying every branch of magic imaginable, hoping to find some great secret or ultimate power that would allow him to defeat Princess Celestia herself, but four years came and went, with no ultimate power to be found. In desperation, Nebula turned to diabolism: he studied the darkest magicks, practiced unholy rituals and prayed to Lord Tenebris of Tartarus for the power to overthrow Celestia. But creatures of darkness prey on the foolish and desperate… Nebula may get more than he bargained for.