Hogwarts University
A world in which a severe shortage of mages for the Auror and Unspeakables allows the construction of an advanced school of wizards to bolster their numbers. Taking place in a Tower that expands into a full college campus on the inside it has the same four houses, but the students are from every wizarding school in the world. Some in this universe happen under different timelines, all the stories take place after their time at Hogwarts and are out in the real world, or the new advanced school full of college age adults and higher.