After The Canterlot wedding and deaths of all but one Element of Harmony, gives a rise to racism and systematical hunting and killing of changelings in Equestria, princess Luna returns from her exile, and a rebellion, The Lunar Guard, rises to overthrow The Solar Empire and to fight for a society without the caste system and violence, in which ponies and other creatures exist as equals.

A bloody civil war starts, with good, evil, and in-between mares on both sides. In total war, the morality is subjective and secondary.
Some will fall and some will live, but which will rise in the end?
The sun or the moon?

The story will be non-linear and composed out of pretty much everything that happened in the war: letters, reports, diaries, pony verions of songs, propaganda films, files, and interviews, maybe propaganda posters and pictures later if i learn to draw ponies.