Niobe serves as a Specter under Hades, designated Niobe of Deep. He wears the Surplice armor common among Hades' forces and wields the Fragrant Deep technique, a scent-based assault that overwhelms foes. During the Hades Sanctuary arc, Niobe infiltrates the Sanctuary to eradicate Gold Saints. He confronts Aldebaran of Taurus in the Taurus Temple, where his Fragrant Deep lands a fatal blow. Aldebaran retaliates instantly with his Great Horn, resulting in a simultaneous exchange that disintegrates Niobe and his Surplice despite his victory. Residual cosmos from Aldebaran's fallen form later alerts Mu of Aries to the Specter incursion, implicitly affirming Niobe's lethal effectiveness. Niobe's involvement concludes with this battle; he features in no other arcs, films, OVAs, or spin-offs such as Episode G, with no further backstory or media appearances documented.