The Disillusionment Charm was usually used by Aurors; it could not even be learned at school. Xu Yue could use it freely only because he had bought enough books, possessed considerable talent, and could combine it with his existing understanding of illusion techniques.
Naturally, it was far more convenient than having to cower beneath an Invisibility Cloak, and it even came with a silencing effect.
Without the Marauder's Map, finding Xu Yue wandering Hogwarts Castle at night would be quite difficult.
The Marauder's Map was something Potter's father, Sirius Black, and the others had made. It could track the movements of everyone at Hogwarts in real time, but Filch had confiscated it.
Filch simply did not know how to use it, and it was later stolen by the prank-loving Weasley twins.
He just did not know whether they had already stolen it by this point. Otherwise, it could be a bit troublesome.
Some items and abilities in this world simply defied reason.
Still, since Xu Yue had chosen to sneak out for a nighttime stroll, he had naturally considered that possibility. Those two were pranksters themselves, so even if they spotted him, it would not really matter.
Compared to that, the priority was to steadily carry out his plan.
This mission lasted a full seven years. For now, his foremost goal was to improve his abilities. No matter how talented he was, he was still no match for Voldemort or Dumbledore.
Uh, of course, the crippled version of Voldemort at present probably could not threaten him...
The Room of Requirement.
This room was located on the eighth floor of Hogwarts Castle, opposite the tapestry of Trolls Beating Barnabas the Barmy. When a user concentrated on the place they needed and walked past that stretch of wall three times, an exceptionally