S4E05 The Demon Behind

After recovering an important Oni Mask Of General Ikazuki, Tohru gets fed up with Uncle’s bossieness, and the two stop speaking to each other. Jade uses the Rat talisman to bring the mask to life, so they can interrogate it. However, it escapes with the intention of attaching itself to Tohru. The mask is accidentally sat on by Finn and ends up stuck to his butt. Undeterred, the mask summons the Samurai Shadowkhan, and captures Tohru, who has the mask removal spell with him. Uncle, unwilling to let his apprentice down, uses shadow magic to take Jackie and himself to Tohru. They fight off the Shadowkhan, and Finn uses the removal spell to evict the mask from his hindquarters, because he had enough of the busybody and noisy mask commanding a Shadowkhan keep carrying and turning him when the Ikazuki wants to talk.