Hogwarts wizards who signed in to Middle-earth...

In the year 1340 of the Shire calendar, a year before the Lonely Mountain Expedition's departure, the Grey Wizard had yet to visit the Shire, the Dwarf King was still forging in the Blue Mountains, and the dragons were still slumbering in the mountains… That year, a young wizard, equipped with the Hogwarts sign-in system, unexpectedly traveled to Middle-earth. Overnight, Hogwarts Castle rose from the ground, standing majestically on the Middle-earth; flying broomsticks streaked across the sky, becoming a unique sight. In the wilderness, the legend of the Black Wizard quietly spread. He was a friend of the elves, the nemesis of the orcs, the nightmare of the trolls, and the lifelong enemy of Sauron, the Dark Lord. Years later, when the Dark Lord was defeated, the elves migrated west, and the human era began, Duir, who had already signed in to various parts of Middle-earth, turned his gaze to that fairyland in the west. [Location: Aman, sign in?]