"Harry has a lot of mental scars," Hermione continued. "But he's not been able to heal them with any meditation or magic he's tried so far. He's just siphoned them off to a part of his mind where he doesn't have to face them. But there doesn't seem much difference between his internal scars from Riddle and some of his other ones. So, I was thinking, if we can get the blood of his other mental torturers, maybe we can make a physical antidote for those wounds, too."