QUICK WARNING: This fanfic was written by a 13-year old who has trouble writing essays for school. If this fic is absolutely horrible offer constructive criticism, not hate comments and dislikes.
On one of Luna's vacations, she comes across an almighty object: the Honto no akumu. This object reverts her back to Nightmare Moon, and aware of what will happen when the Elements unite, she kidnaps all of them. Only Rainbow Dash escapes. However, Nightmare Moon manages to see what happens and sends some of her now-corrupted lunar guards to shoot Rainbow down. Rainbow barely survives and crash-lands in the refugee-filled, unnamed hideaway. Fortunately, most of the village's residents are technological geniuses from Canterlot, and they have been forging new weapons to combat Nightmare Moon. After nursing Rainbow to health, they bless her with the most powerful weapons they created: The Hamoni no buki. The laser gun and barrier can alternate between firing and protecting against solar energy, and doing the same with Lunar energy. On a quest to save her friends from Nightmare's grasp, Rainbow must fight against solar and lunar guards from Los Pegasus to the now distopian Canterlot, and find out why everyone has been referring to things in foreign languages! Or maybe that's just her.
Crossover with Ikaruga. I do not own the characters from MLPFIM or anything from Ikaruga, save for a copy of the game myself.
(Now remains on my profile as a memorandum to how horrid I was at writing crossovers.)