This story is a sequel to Lightning's Revenge

Rainbow Dash and her older brother, Rainbow Blitz have been separated for five years. One day, he comes back to CHS, startling everyone.
They have a nice reunion, while in the darkest corners of Canterlot, evil plans are plotting.
Lightning Dust and her team have come back, with vengeance in tow, here to seek revenge once again on Rainbow Dash for what injuries she has inflicted in her past.