Good things never last.
Five hundred years passed since the events in the original Fallout: Equestria by Kkat (link below), and a mysterious new variant of Taint has emerged out of the shadows- nicknamed 'Black', the necromantic slime turns anypony unfortunate enough to die in contact with it into a creature that has never been seen in Equestria before. Soon it becomes obvious that Black isn't a natural occurrence, and an investigation begins and inquires how, why, and who brought this terrifying new variant to a land rejuvenated of its former glory.
Meanwhile: Rover, a former soldier during the second Equetrian Civil War right after the appearance of Black and now a freelance mercenary; is suddenly hired by the Twilight Society to bring them a specific alicorn female- for an unreasonably high price. Then he discovers that the high price isn't too much of an exaggeration as almost every faction in New Equestria is attempting to get ahold of this alicorn. Why is she so important?
Read Fallout: Equestra: http://www.equestriadaily.com/2011/04/story-fallout-equestria.html
Note: FoE: The Drowned is a crossover fanfiction. Important elements from: The Drowning(iOS game), Fallout: Equestria, and MLP:FiM. Minor story elements(similarities) may include: BioShock: Infinite, Red Dead Redemption, and The Last of Us. Unless referenced, no other Fallout: Equestria side story applies to FoE: The Drowned(i.e. Blackjack might not exist here, unless stated otherwise).