In the novel, those kinds of fruits were not supposed to appear this early yet. They were meant to be revealed much later, during the Magus Spire Arc — when Zian and the others discover the truth hidden inside that tall structure.
That moment was supposed to show not only where the fruits came from, but also the dark corruption inside the Spire.
As it turned out, it had once been a place people truly respected, where the finest magus gathered to learn and grow. There was a time it meant something.
But that meaning was already gone — at least for Ruvian. Because behind its grand image, it had quietly become a secret base of the demons.
In the depths of that place, the demons continued their work silently.
Morals did not matter to them.
They tore lives apart as they pleased, twisted them, and reshaped them into whatever they needed. And among the many twisted creations born from that hidden madness…
…was that Devil Fruits.
