''Indeed, but that selfless act caused many side effects, one deep alteration of Corruption among them.'' Seyraphal was holding her cup with all four of her hands now and spoke while looking into the liquid. ''Demon Lord Daiyu Jawahir is a succubus, a species of female demons, and it would seem that peculiarity spread throughout the Corruption of Mamonos after she ascended the Demonic Throne.''

''You mean Monsters are always born women because of this? The Demon Lord belonged to an entirely female species, and that spread into Corruption itself?'' For the first time in history, a generous Lord of monsters sat on the Throne, yet her gift of sentience made it nearly impossible for monsters to evolve away from mankind.

''Maybe only people close to her lordship can answer.'' Says the moth. ''Each new lord brought change to Monsters, and in our era, Daiyu's gift of sentience is tainted with a feral curse.'' She leaned on her chair to face you properly, her prior hesitations slowly but surely eroding. ''Corruption itself is a force inherent to monsters that is simultaneously inside our bodies and souls; it is the reagent that allows unusual bodies like mine to live without reality's implacable hold slowly but surely killing me.''

''Too little and your body will be treated like wild magic by the world.'' Seyraphal nods to your words. ''Too much will cause instability between souls and bodies, which I suspect can cause diseases or mental strain.''

''A strange phenomenon happens to communities of Mamonos that do not expunge their surplus in a vessel. Emotional and eventual mental degradation is an inevitability that results in people adopting the monstrous side of their bodies, reverting to the monstrous side of their ancestors.''

''There's no way to store this surplus?''

A surge of caution causes Seyraphal antennas to make a gentle chirping noise. ''It's only a temporary solution. Are you aware of the Red World, Rey?''

Unity
''Yes. Mother Earth's safeguards this material realm of ours while Father Sky gazes into the myriads of branches. This Red World is where the surplus of magic and souls are dissipated into, creating a chaotic realm of life populated by endless spirits in a constant feeding frenzy; this is the hell that souls discarded by Father Sky are condemned to slip into.''
Learning that certainly left a strong impression when you were younger.

''Corruption that isn't stored in a living vessel is a direct medium between these wayward entities and our realm, allowing them to gestate bodies without any divine obstruction.'' Seyraphal finished her tea while her two lower hands gently groomed her long white wings behind her.

''Then it is a physical manifestation of souls? The resource that allows you to keep a good synchrony with your bodies...'' Your summary earns you a nod from the calm moth. ''Something that, somehow, mankind isn't forced to deal with.''