—Hakudōshi Mōryōmaru (魍魎丸, "Perfect Monster") is a composite yōkai vessel created by Hakudōshi and used by the Infant to combat Naraku. As far as personal essences go, he is actually the Infant, the physical embodiment of Naraku's heart, and his yōki cannot be detected due to the Fuyōheki, a stone which completely masks the presence of any yōki near it.