In Episode 10 of Blue Exorcist: Kyoto Saga (Ao no Exorcist: Kyoto Fujouou-hen), titled the battle against the Impure King reaches a fever pitch as the sporangium finally bursts, revealing the demon's massive true form. The Fight for the Barrier
attempts to use her familiar, Nee, to save Izumo Kamiki , but she quickly realizes her strength is ebbing as the miasma impurity spreads rapidly. Ao no Exorcist: Kyoto Fujouou-hen (Dub) Episode 10
and Renzo Shima manage to reach the main camp to relay critical news about the barrier's status. [Spoilers] Ao no Exorcist - Kyoto Fujouou-hen, episode 10 In Episode 10 of Blue Exorcist: Kyoto Saga