Arithiel

After Dumbledore’s death, Harry spends the summer at The Burrow. A letter from Sirius, describing a magical spell to transform into an Animagus, is handed to him by Remus. Sirius writes:"What I can give you is the same knowledge we had when we were at Hogwarts. By 'we' I mean Mooney, Padfoot, Prongs and that other creature I cannot bring myself to name…When I was living as a fugitive, my life would have been unbearable without being able to transform into 'Snuffles', as you three call me when I am Padfoot." The animal one transforms into isn’t chosen: it is already there waiting to be uncovered by this magical spell. In the days that follow, Harry needs all his animal’s strengths to combat the evil infiltrating The Burrow.