From Thousands of Others by mennonitethespian

Rated: 6th-7th Years •
Summary: An alternate take on the seventh year of the Harry Potter Series. Harry leaves Privet Drive for the last time, of age and pursued by Death Eaters and dark words. As he struggles with Dumbledore's final task, he encounters a new potions mistress, ancient magic, and new depths of Hogwarts and the Department of Mysteries. But before he can challenge his greatest enemy, he must learn about the "magic that Voldemort knows not" from thousands of others.

JK Rowling's universe is all hers, but it's too fun not to play in.