Orochimaru travels to Hogwarts

Orochimaru would never forget that afternoon when he told Dumbledore he could use the Impure World Reincarnation to resurrect the dead. That was the first time the White Lord felt he was more terrifying than Grindelwald and Voldemort combined. Orochimaru thoroughly enjoyed this, then turned to Voldemort, whom he had pinned to the wall, and asked the question that had lingered in his heart for years: "Why is it that killing someone allows you to create a Horcrux and thus achieve immortality? Are you sure you're not lying to me?" "By the way, would you mind if I used your body to experiment a little?"