Twilight was your run of the mill magic high-school unicorn/human hybrid. She's already had a troubled past with her family but when her friends Sunset Shimmer and Flash Sentry "introduce" her to a mysterious man with an even more mysterious abilities with a past even worse than her own, she'll be forced to make the ultimate decisions that will test her very sense of Morality.

Alternate EqG crossed between a heavily modified Crysis world.

(I'm throwing on a Mature-Sex tag for chapter four, just to cover my ass. It's implied but it's there.)