“He who fights monsters should see to it that he himself does not become a monster.”5

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There was a kind of monster called a Hundun. It was an insidious and wicked creature, and whenever it met a good person, it spoke ill of that person and ate them. However, it was friendly and gentle to bad people. A Hundun usually stayed quiet, but it occasionally chased its own tail for a while, then looked up at the sky, smiling. The monster was a good analogy for chaos and a symbol of the space outside of the universe, where the beings of Nyx had settled.0

‘When one looks into an abyss for too long, they become a monster… So that means they need to be able to look a monster straight in the eyes first. And that monster is a Hundun.’0

Mephistopheles called the latter part of [Prelati’s Spellbook] the Four Steps of Abyss, which referred to the four steps one had to take toward the <Abyss>.0

“Once you climb up all four steps, you’ll be able to become an Outer Celestial,” Mephistopheles said.0

Chang-Sun would become an Outer Celestial, not an Otherworld Celestial. In other words, Mephistopheles was saying that Chang-Sun would become like him.0

Badump, badump―!0

That made Chang-Sun’s heart pound harder as he thought, ‘It was a stroke of genius to become Mephistopheles’ disciple.’0

There were also the Ten Elders’ lessons, and he had not yet completed the plan he had made with Thanatos. Thus, Chang-Sun would be able...0