When Poison Ivy;daughter of Queen Chrysalis;is assigned to go to Twilight's so she can learn to control her powers,she starts hearing voices in her head. Everything goes downhill from there.
'Fire Tan' A former Red guard marks-mare finds herself in a post cold war nuclear Apocalypse world, after finding her former commander 'red shine' she finds her self in the midst of an invasion on USA mainland.
(Inspired by Boatmurdered, the famous Dwarf Fortress succession game) If you check the official Equestria map, you see a place called "Undiscovered West", north of Las Pegasus. Why was It never explored?
In the neverending Nightmare Night, a lone Pegasus Swordsmare defends Canterlot City from the machinations of the Fruit Bat Vampires that threaten the very fabric of Equestria's existence.