The Millennium Earl pursues his objective of seeking out people in despair who've lost their loved ones to create more Akuma. While recuperating Allen meets Lavi, an experienced Exorcist, and the Black Order begins to use the Bookmen to gather information about the Noah Clan. Allen is unsure about being an Exorcist when it involves killing humans like the Noah, however Lavi explains the significance of wearing the Exorcist uniform. Because Exorcists cannot distinguish disguised Akuma from humans, the uniform is a way to attract Akuma to them and protect humanity. This is dramatically borne out when they are attacked by a group of Akuma who initially seem like normal citizens.