12 Deadliest Spells in the Harry Potter Universe

This spell is little known among wizards, but those familiar with it know what it can do. Sectumsempra was created by Severus Snape in his youth. He wrote it down in his copy of the Advanced Potions manual along with the phrase “for enemies”. Harry “fired up to try” after he discovered it in Harry Potter and the Half-Blood Prince, but he didn’t feel it was wise to do it in front of Hermione.

Harry gets his chance when, later in the book, he finds Draco Malfoy crying in the bathroom. He already suspects that the younger Malfoy has become an official Death Eater, and Harry finds this behavior suspicious. Harry is not wrong about Draco: he took the Dark Mark and was instructed to kill Dumbledore, whom he is fighting. He realizes that Harry is behind him and they duel and Draco is about to cast the Unforgivable Curse on Harry’s side. It is disabled when Harry uses Sectumsempra.

The effects are immediate. Draco falls to the floor, blood gushing from his chest. Luckily, Professor Snape shows up and is able to use the counter-spell to save Draco’s life. Without outside help, he would surely have bled to death, which makes this spell very dangerous indeed. With the right intent, the spell may cause less harm (as seen when a young Snape cut James Potter’s cheek with it), but in combat it is deadly.

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