AU. Azkaban is loosing the Ministry thousands of galleons. They need to keep the prison open but need a way to turn a profit. In a stroke of brilliance, an official determines that they can let the prisoners vent energy as well as make money by starting the first Azkaban Prison Team, called The Dementors. This is the story of Prisoner Hagall, Sigel 913, Beater for The Dementors

Wizarding Britain has existed for millenniums. It's wizards and witches have spanned the globe, learning, adapting, and sometimes repressing the native magics. In the late 20th Century, the war with Voldemort caused damage to the world's magic, causing creatures long since defeated to rise. The return of the ancients comes on both sides though.