New Pegas follows Dead-Shot, an earth pony stallion and former caravaneer. He takes bounties to eliminate ponies, so long as they deserve to die --- and in his view, that's most of them. Joined by an annoyingly chipper robot which seems to know more about him than he'd like, Dead-Shot soon finds himself sucked into a whirlwind of events and factional politics he couldn't care less about.
But he'll learn to care, because war... war never changes.
Story can be read here: FimFiction.
Mr. Horse's pet courier has been murdered and his property stolen. And while the price on the killers' heads is good enough to get any bounty hunter's attention, it's the bonus for returning a silly little poker chip that draws Dead-Shot in.
A pony could retire on that kind of jackpot...
Intended as FO:E's "New Vegas", the story is set in the far west of Equestria around the city of New Pegas (formerly Las Pegasus, until a vote was held to differentiate the high-desert city from the west-coast metropolis of Los Pegasus). Although numerous details will be familiar to players of the game, including much of the geography and wildlife of the surrounding area as well as pony versions of various factions, a number of significant departures are clear, such as the appearance of non-mutated Diamond Dogs wearing finery and carrying unusually ornate weapons.
Calbeck considers most elements of Fallout: Equestria, Project Horizons and Pink Eyes to be canon to New Pegas, making references to all three at various points. One example is a game of Caravan with mystical overtones, wherein references are made to the protagonists and villains of those stories during the course of the game. He and A Friendly Hobo have also agreed that New Pegas and Tales of a Courier are mutually canonical, with the Moohave Desert becoming the Ponave far to the northwest of New Pegas. This is similar to the way that various deserts in the American Southwest border and overlap one another.
More recently, references have been added to Second Wind and Rangers of Wintertrot. In the case of the former, an ongoing deliberate collaboration is in progress. Dead-Shot and Elder Inkwell have psuedo-canonically exchanged correspondence via Robronco Terminal in the Tumblr blog AskCherryPie.
Story has its own tumblr, which can be viewed here. AskCherryPie