Brewing a Potion

The students in class all cared deeply about Felix Felicis.

But Jon knew that the miraculous effect of Felix Felicis was not changing luck, but guidance.

Just like the Time-Turner.

There was no true Time-Turner in this world, nor was there any magic capable of truly controlling time. So-called Time-Turners were merely a form of record, constantly jumping to find the right point of intervention. The Time-Turners previously stored by the Ministry of Magic—though they had now all been smashed, leaving only the genuine Time-Turner crafted by a master alchemist in Dumbledore's possession—probably worked according to this principle.

Through the powerful divination magic inscribed within the Time-Turner, it determined what the user needed to do, whether it was studying or something else. The Time-Turner first learned what the user needed to study, then split off a shadow during that period of time. When the time came, those memories would automatically return to the user's mind, creating the illusion of traveling through time.

When Harry had used it in his third year to save the Hippogriff, and later Sirius, that Time-Turner had been a genuine one—the one made by Nicolas Flamel. But even that had used the principle of overlapping time and space, causing no effects beyond Hogwarts.

There was no such thing as altering history in this world. There was only creating history.

Hogwarts had an enormous barrier, and in some ways, it was somewhat similar to Helga's Small World. Under the effects of the Sleeping Dragon Barrier, time and space could be twisted, though there were many restrictions. Rewinding time within a small space was not particularly difficult, but the immense backlash had directly destroyed the Time-Turner completely.

Because reversing time was not a power that belonged to ordinary people.

The same was true of something as intangible as