Hermione gasped. This room represented the damage to her soul. In here her spirit and soul existed. If anyone was to find this room in Legilimency they could destroy her. Every time she killed someone with the killing curse her soul would split like this. She gave a small thanks to Morgana and Merlin that she didn't kill Greyback with the killing curse too. She would have to be careful; using the Avada Kedavra was how most of the Death Eaters became insane.