Hogwarts Asylum

In the corridor, after sending Filch away, Orolin still did not enter the room. He had just seen Harry being pulled into the mirror by the Weasley twins through Eagle Eye magic.

But they haven't shown up yet, and they don't know what they are doing. Although his Eagle Eye magic allows him to have a 360-degree view without blind spots, if it penetrates the wall, he cannot see that far, and where Harry and the others are staying is Just outside his field of vision.

So O'Loughlin could only wait for them to show up again, otherwise how could Harry "accidentally" discover the big dog later?

O'Loughlin was not surprised by the appearance of the Weasley twins. After all, no one who had read the original novel did not know the existence of the Marauder's Map, a hide-and-seek artifact.

Not to mention, when the four Marauders were making the map, Olorin quietly hid behind them and watched, and even slightly tampered with the Marauder's Map.

So, to be precise, one more producer can be marked on that map.

But Olorin has no interest in leaving his name.

The Marauder's Map is indeed very complex, but it's also true to say it's simple. The four Marauders' magical attainments were indeed good when they were in school, but the reason why they were able to successfully create the powerful Marauder's Map was actually It's because they found a way around it.

In the time and space of the original work, it is unknown how they came up with the idea of ​​making the Marauder's Map, but here, where Oralin exists, they mainly wanted to find traces of Oralin.

After all, before he learned the magic of illusion, Oralin had already used the Phantom Curse to make ghosts disappear, let alone after learning the magic of illusion. As long as Oralin didn't want to, even Dumbledore could only face his illusion. Talk, don't even think about finding the location of his true body.

If someone must be able to see through Oralin's illusion, it can only be Professor Flitwick. After all, he was the one who had the most contact with Oralin at the beginning, and Oralin asked him for advice when he created the illusion magic. ideas and magic.

This little old man who is cheerful all day long and looks harmless to humans and animals may have noticed all the stupid things Olorin did when he was in school, but he just doesn't want to mention them.

However, Oluolin is very confident in the current illusion magic, which has been updated many times. After all, almost all the ideas and magic when it was first created have been overthrown and revised.

As for Snape, he was just paranoid about being persecuted.

Therefore, in order to catch Orolin, the four predators spent almost all their efforts on making the Marauder's Map.

At first, after they drew the map, they just used the Human Traces Charm, which is a somewhat ancient magic. According to the content in the book, this magic was first used by a wizard who lived alone in the wilderness because of enemies everywhere to guard against intruders. And invented.

It has a very powerful effect and will not be fooled by various disguise methods.Whether using invisibility cloaks (including the legendary Invisibility Cloak), Polyjuice Potion, or undergoing Animagus transformation, the Human Trace Spell can provide correct identification.

But the plunderers soon discovered that the human trace spell could only show black dots on the map, and they could not tell who those black dots were. After all, for the inventor who had few relatives and friends, as long as he was close to his residence, All are enemies.

Moreover, as long as you get closer to a larger person, just like when Oralin stood next to Peter, who was already a bit bloated at the time, the small black dot representing Oralin on the map will become the same as the large black dot representing Peter. Together they are indistinguishable.

They didn't realize that the big black dot would engulf the small black dot at all. After all, they didn't know that Olorin had been standing by their side from the beginning.

When it comes to identifying who the black dots represent, they immediately thought of combining name magic with trace spells. But the problem is that name magic requires all teachers and students in the school to sign on the map or sign a contract with them. How is that possible? .

So James put his idea on Dumbledore's head - to be precise, the Pen of Acceptance and the Book of Access.James's original words were that when he was looking for information about name magic in his family's collection, he found records about these two things, and the book mentioned that both of them were in Hogwarts and were used to detect And record the newly born children with enough magical talent in the UK and Ireland.

The inventors of these two things are generally considered to be the four founders of Hogwarts, but no one knows the specifics because they were already here before the completion of Hogwarts Castle.

So the four Marauders wandered around all day, looking for places where the Pen of Acceptance and the Book of Access might be stored. Then they followed Professor McGonagall and found the Room of Requirement that couldn't be plotted on the map - she At that time, he was already the vice principal and began to be responsible for copying the list of new students from the admission book.

Of course they couldn't go into the Room of Requirement with Professor McGonagall to look for things. They had to study outside the Room of Requirement for a long time before they knew how to use that magical room, and it took a long time of trial and error to find where the Pen of Acceptance and the Book of Access were stored. s room.

After that, it was easy. While Auroran was observing two magic items in his invisible body, they connected the Marauder's Map with these two items - it was very simple, just use the pen of acceptance to copy the names of all the teachers and students in the school, and then The Marauder's Map transformed into a powerful object with similar effects to the Book of Access.

But this only allows the names of people with magical talents within the map to appear on the parchment, and cannot be linked to the human trace spell.

They finally used another name magic to achieve the current effect.

However, the four predators still failed to discover and solve the problem of the big black dot annexing the small black dot, but it didn't matter. After all, there were two names next to a big black dot, and everyone could tell that there were two people there.

It was during this process that Olorin tampered with the Marauder's Map, causing his trace to be delayed for several days before it could be recorded on the Marauder's Map.

This is also the reason why the four Marauders still couldn't catch Orolin. At that time, they were holding maps and fighting with the air in the castle. It was really funny, but they didn't throw away the Marauder. Maps, after all, are really useful.

As for the reason why Harry saw the black dot representing O'Loughlin and stayed in the school hospital, it was because when the school first started, O'Loughlin sneaked into the Weasley twins' dormitory and changed the Marauder's Map so that he His traces were fixed in the school hospital, during which he gave Harry a new look.

Olorin did not take away the Marauder's Map directly. After all, he had a larger and more complete map.

This is something that the four Marauders did not discover. In fact, if they could draw a map of the entire UK and Ireland, then all wizards born in the UK and Ireland would not be able to escape the Marauder's Map - as long as their The name appears in the Book of Admission.