"The [Secret] of the Leader of the Holy Light's death—its worth—I do not have an equivalent [Secret]."
The inorganic voice revealed a trace of regret, but the anomaly of the transaction did not dissipate; [Mystery] displayed its greed.
It was not about the lack of equivalency but rather "not being unable to pay." Merchants are never satisfied with fair exchanges; they exploit the client's needs to extract gains. What Mr. Dark truly desired, he and [Mystery] were both well aware of.
"The answer."
"The primordial concept, as a fragment of the world itself—you can provide me with the answer I seek. Use the secret of the angel's fall as payment, [Mystery], respond on behalf of heaven for me."
"Having experienced betrayal, having embraced death, their monumental deeds undone, has the radiance of the heavens ever dimmed?"
...