1.Lord Voldemort:

Lord Voldemort forces his will on a large section of the Wizarding World and, in doing so, transcends Grindelwald's actual power as a tyrant. Voldemort's mastery of the Dark Arts inspires fear in a manner that no other villain could hope to.
Even when he is presumed dead, wizards fear taking his name, and doubt that if such a wizard could really be defeated once and for all. His Horcruxes make him nearly indestructible, invincible, and immortal: tools few other Harry Potter villains are willing to abuse. He is the most powerful wizard feared by mankind, but this comes at the expense of his humanity.
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