Severus Snape, also known as the Half-Blood Prince, was a slytherin during his time at Hogwarts. He was best friends with his crush, Lily, until they got into a fight and he called her a slur. He got into dark magic and became a death eating, joining in Voldemort's opposition to muggles and muggleborns. When Lily was killed, he turned against Voldemort, becoming a spy for Dumbledore. He was a teacher at Hogwarts, bullying children, although he saved Harry many times. He killed Dumbledore after Dumbledore told him to do it. In the end, Nagini killed him so Voldemort could assume master of the elder wand, although it really belonged to Draco.
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