When Sagreles returned to Hogwarts, it was already the afternoon of the next day.
The purpose of this trip had been perfectly achieved. Sitting in the chair in his office, he stared at the exquisite hourglass in his hand, a pure smile appearing on his face.
The Time-Turner—the Ministry of Magic's most highly classified item, restricted to approved users only. It was an extraordinarily special magical device with only one purpose: time travel.
He remembered that in his previous life, the famous theoretical physicist Stephen Hawking had proposed the "Chronology Protection Conjecture." He believed quantum effects would prevent macroscopic time travel and avert all paradoxes.
More than twenty years had passed, yet those theories still left vague impressions in his mind. After all, he had once believed firmly in science.
But ever since he had transmigrated, he had put his faith in magic instead.
Going back to the past—without a doubt, it was something everyone had longed for at some point.
Sagreles was no exception, but that had been before his transmigration. He was researching the Time-Turner now not to return to the past and make up for regrets, but solely for magic itself.
After examining the hourglass from every angle, he couldn't help frowning.
"Let me think..." Sagreles fell into thought. "There are several things to watch out for: the Grandfather Paradox and the Butterfly Effect. The former causes logical contradictions and triggers Timeline Collapse; the latter can make the predetermined future unrecognizable because of tiny changes."
The essence of Timeline Collapse was reality losing its logical coherence. Its consequences far exceeded humanity's capacity to understand or control. It wasn't merely physical destruction, but a complete negation of the meaning of existence, causality, and free will.
Sagreles tried to understand time travel through his own knowledge, but quickly gave