Grindelwald
Grindelwald is a fictional character from J.K. Rowling's Harry Potter series. He is a powerful and ambitious Dark wizard who first appears in the seventh book, "Harry Potter and the Deathly Hallows." Grindelwald is known for his ambition and desire for power, which led him to create the Dark Arts organization, the Order of the Phoenix. He is also responsible for the creation of the Horcruxes, a method of achieving immortality. Grindelwald's downfall came at the hands of Albus Dumbledore, who defeated him in a duel and subsequently killed him. Grindelwald's legacy lives on in the form of his followers, who continue to promote his ideals of pure-blood supremacy and the use of Dark magic. His story is a cautionary tale about the dangers of unchecked ambition and the consequences of using Dark magic.