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Upon reaching the depths of the Nightmare Realm, Blake was finally able to face the mastermind behind this entire incident, Belphegor, the Archdemon representing the Sin of Sloth, a lazy and yet cunning figure that employed the unique power over Nightmares and Dreams he possessed to take over countless living beings in a matter of days or weeks.
In the past, this evil Archdemon had managed to shroud entire star systems inside of his Black Fog, consuming the living beings' souls and vitality by letting them fall into eternal slumbers that they never woke up from.
And now, that monster had decided to step into Spiritias and finally expand his own Authority, perhaps he had done it so late because he was the laziest of the seven, or perhaps because he was afraid of Blake and targeted this far away continent in hopes for him noticing.