Gender: Female Race: Angel Appearance: As shown in the image Authority: Self-Negation ・Defines the set of all sets that do not contain themselves as elements as δ = {x | x ∉ x}. The moment a target is included in δ, an infinite cycle of self-reference occurs, and the target becomes completely undefinable, unable to be determined as existing, not existing, or in any state whatsoever. ・Undefinability does not destroy the target; rather, it prevents any determination about the target from being established and prevents any relationship with the target from being formed. Therefore, even comparisons like "stronger than the target" or "defeating the target" cannot be established, and the scale of strength itself cannot be applied to this authority. ・The essence of this authority lies in the ability to freely manipulate the set δ, where all the aforementioned conditions fail to be established.