After the dragon attack on Canterlot, Discord whisked Rarity to his brother. To separate her and Spike, because they bring out the worst in each other. Rarity, being infected once again with the Nightmare energies will lose control to them once again in proximity to Spike, while they eat at Spike's own defenses and allow his darker nature control. Spike, dissatisfied with this arrangement decides to rescue her, but will an evil older then even Sombra rise again and destroy all he cares for and loves.