Armagan’s City was a mythical Dragonborn city founded by Armagan. Supposedly, almost all of the Dragonborn alive live there.
The founder of the city, Armagan, had an army of Dragonborn soldiers he used to attack Arcold and the other cities that were present at the time. Information from The Protectors secret base indicates that The New Order was involved in tricking Armagan into his assault. After the attack failed, he and his army retreated into the unexplored western areas where he founded Armagan’s City.