Even Dragons

"So comes snow after fire, and even dragons have their endings." But how does one slay a dragon and reclaim a homeland in a land without magic, where the monsters are men? (Modern AU of Thorin, Gandalf, Bilbo, and all the rest-with an especial focus on the Durins, and much high adventure!) (T for violence, angst, language, and a bit of romance. NO SLASH at all. AT ALL)