During the fifth decade of the twenty-first century, the world is plagued by monsters known as the somber-lain - a conglomerate of entities made up of vampires, werewolves, zombies, and other creatures that go bump in the night. Underground dwells a facility known as the somber-lain chamber: a resistance base dedicated to wiping out the somber-lain for good. Twilight Sparkle, the secret weapon concealed within its walls, is tasked with saving as many people as possible, but their darkest day has yet to come. Only through struggle will a brighter dawn arise...