Master of the Underworld... or rather, Hades, King of the Underworld; even ordinary people wouldn't find such a name unfamiliar, let alone Nero, who had been active in the mortal world as a Transcendent before becoming a Black soul envoy.
But as a Transcendent, even if one has heard of Hades' name, it might mostly just be considered a deity in legends—just like Nero jokingly referred to herself as [a certain Zeus the Frenzied] at the beginning.
However, as a Black soul envoy, Nero has evidently experienced a level far beyond her time as an Archangel of the Club of Michael... her perspective naturally can't be compared to the past.
"Are you really Hades?" Nero looked at the guy claiming to be Hades with a face full of astonishment... let's call this guy Old Ha for now—Nero thought.
