In Brightest Day: The Second Front

[This story acts as a side-story to In Brightest Day...] The evil of Nightmare Moon's Blackest Night cannot be contained, seeping into another realm and bringing about darkness and death. Sunset Shimmer, having self-exiled herself to an alternate universe, must take up the power of the Emotional Spectrum to protect Earth! The fight begins on - not one - but two fronts!