Luna nodded. "He had to. And my little girl has seen how it happens, too. Harry's going to ask his dead ancestors to pull Riddle through and trap him somehow on the other side. Don't ask me how that works, that's a secret that Harry hasn't even shared with Hermione yet. Riddle cant ever be fully destroyed ... for once energy enters the universe it can never leave it ... but Harry does know that there is a dimension to the afterlife that nothing can ever escape from. He described it like a Black Hole for corrupted spirits ... and my daughter has had nightmares about it, too.