Fans of “Harry Potter” are pretty familiar with Horcruxes — and know that they’re some of the darkest, most dangerous magical artifacts in the entire universe. We only see ones created by Voldemort (played on-screen by Ralph Fiennes), and as was previously mentioned, they’re created in one way only: by committing cold-blooded murder. At that point, you fracture your soul, and the severed piece of your soul that’s a result of committing said murder gets lodged into some sort of object. Voldemort ultimately creates seven of them spread across various magical artifacts, including ones that once belonged to the founders of Hogwarts — like Helga Hufflepuff’s cup, Rowena Ravenclaw’s diadem, and Salazar Slytherin’s locket. As Harry (Daniel Radcliffe) and Albus Dumbledore (Michael Gambon) investigate the Horcruxes, they realize just how many Voldemort has made … and understand that in order to truly kill Voldemort, all seven Horcruxes must be destroyed.
The quest to destroy the Horcruxes takes Dumbledore’s life and, ultimately, Harry’s as well … mostly because he’s an unwitting Horcrux created when Voldemort tried to kill him as a baby. He’s able to sacrifice himself willingly to destroy the Horcrux and return to defeat Voldemort once and for all, but there’s no question that the journey to find and ruin the Horcruxes is the most taxing mission of Harry’s life.