World's Death—Taboo.
This was the first time Iver had clearly learned the former name of the Path of Twilight, as well as the Source River to which that Path belonged.
Before this, Iver had only known that five Pillar Gods had been born during the "Cicada's Metamorphosis" incident—the Pillar Gods of the Paths of Adaptation, Twilight, Wisdom, Power, and the Beast had all been born after the cicada's metamorphosis. As for whether those Paths had once had masters, or what they had been called, Iver knew nothing.
"...Error."
Iver muttered to himself.
The Source River belonging to the Path of Adaptation was "Survival," while the Source River belonging to the Paths of Transcendence and Metamorphosis was called "Change." Both were easy enough to understand.
But why did "Twilight" and "Taboo" belong to the River of "Error"? Was there some inevitable connection between them and error? In that instant, Iver suddenly recalled what the Ring Angel had said when it manifested:
—When the world changes and cycles, all things remain eternally unchanged.
—The just will remain just, and the filthy will remain filthy. Kings will always be kings, and slaves will always be slaves.
—No one rises, and no one falls. Nothing ever changes. The universe has already solidified, like the Amber Egg; the world cycles through Eternal Calamity, just like the Ouroboros.
At the time, Iver had not understood what the Ring Angel meant. But now... after receiving information from Professor Moriarty, Iver seemed to have grasped a crucial point.
Eternal Calamity...?
"...I have a question."
Iver was silent for a moment before asking, "The world line you come from... does it also have the 'Path of Twilight' and 'Amber'?"
"Yes."
Professor Moriarty answered with certainty, "But I'm not certain whether it has always existed.
"I think that if the