The main difficulty in summoning a demon was to successfully build a Demonic Altar and then create a pure magical being.
The difficulty of building a Demonic Altar was very high. Many materials and evil and bloody sacrifices were required.
Elwyn could not gather most of these things, nor did he know how to use them.
Needless to say, the process of building a Demonic Altar and summoning a demon for the first time was very dangerous. Accidents could easily occur.
One could lose their life if they were not careful while casting such profound black magic.
With the superficial knowledge that Elwyn currently possessed, there was not even a one in ten thousand chance of success.
With all these unfavorable factors, he naturally would not try the summoning method recorded in "Top Tier Black Magic Revealed".
However, if he could successfully activate a Demonic Altar, most of the problems could be easily solved, and he would not have so many concerns.
As long as the conditions were met, he could summon the demon that had already been created by the altar.
What he needed to do was to meet the conditions of the altar and use magic to enslave the demon that was summoned.
With Elwyn's current strength, the chances of success were very high.
Evil and taboo aside, the might of demonic magic was very powerful, far surpassing that of ordinary black magic.
Controlling a powerful demon could help a Magus defeat most of his opponents.
From the traces of magic in the surroundings, this Demonic Altar could summon a high-grade demon that had the ability to attack with ice.
If he had such a powerful helper, it would not have been so difficult for Elwyn to fight the man-headed lion scorpion-tailed beast.
He would also not have to wait for so long. He would only be able to enter the ruins after he found the help of Keresis, the vampire.
An unknown demon could help Elwyn do many things that he was unable to do in the past.
There were many people around Elwyn who were holding him back, but there were not many who could help him.
Honestly speaking, after seeing this activated Demonic Altar, he was a little tempted.
However, what he needed to do now was not to summon the demon. There were still many things he needed to understand.
"Dobby, let's go in and take a look!" Elwyn said.
He walked down the steps and tapped his magic wand on the ice wall in front of him.
The tip of the magic wand continuously emitted white mist. Soon, an entrance was formed in the thick ice wall.
Elwyn led Dobby in. While he was shocked, he also got to know the whole picture of the Demon Altar more clearly and directly.
The altar was made of huge stones that formed a concentric circle. It was much more magnificent than it looked from the outside.
The stone was roughly rectangular and stood upright on the ground, more than ten feet high.
On top of the adjacent rock, there was another rock lying horizontally on top, sometimes two, sometimes four, arranged to form a strange pattern.
Several important positions seemed to be related to the changes of the planets, and were not meaningless shapes.
The surface of the stone wall was covered with oddly-shaped holes, which were inlaid with gems that emitted a faint glow.
The most eye-catching part was the center of the concentric circles, which was paved with a large piece of green stone.
Dark golden magic symbols and complicated patterns were drawn on the surface of the boulder, and the entire boulder glowed with a pale blue light from time to time.
Every time the pale blue light flashed, a large amount of cold air was released.
Because of the extremely low temperature, the cold air met with the surrounding air and created a large amount of white fog.
Even with the protection of magic, Elwyn could feel a wave of cold approaching him.
He hurriedly pulled Dobby and carefully hid behind the boulder to avoid the icy fog. After the fog disappeared, he continued forward, bypassing a few boulders and arriving at the core of the altar. He saw the huge devil statue that he had seen on the stairs outside.
Previously, there was a wall of ice, so he could not see it clearly.
Now that he was inside, he noticed that it looked like a house-elf.
To be more precise, it was a mutated devil based on a house-elf.
This house-elf's skin was entirely blue, and its face did not have the humble and fawning smile that Elwyn was familiar with.
Instead, it had an indescribable viciousness, and the corners of its mouth slightly curled up into a cold smile.
It raised its hands slightly, making a strange gesture.
Elwyn carefully observed the statue. If he was not mistaken, the devil that the altar could summon was this fellow.
What he did not expect was that this devil was actually a house-elf!
It had to be said that the dark Magi who built this place had quite the unique taste and hobbies.
Elwyn did not enter the center of the concentric circle that flashed with blue light from time to time. He used the boulder outside as cover and walked around the entire altar.
There were signs that this demonic altar had something to do with the house-elf of the Hogwarts.
It would appear here from time to time for no reason, so there must be some secret behind it.
The stone platform in front of Elwyn's statue, which was used to place the offerings, was engraved with densely packed ancient magic runes.
If he was not mistaken, the runes should have recorded the origins of this devil and the offerings that summoned it.
These ancient magic runes were not too unpopular, but it would still take time to decipher all of them.
He recorded all of these runes and the magic runes on the ground, and carefully searched the altar again before leaving with Dobby. He was ready to study everything clearly before taking the next step.
Dobby finally heaved a sigh of relief. He watched with lingering fear as the cabinet filled with the heads of the blue house-elves returned to its original position, completely blocking the entrance of the passage.
He had finally come out of that terrible place below, and he swore that he would never go there again.
Elwyn warned Dobby not to tell anyone about what happened today.
If someone found out that a demonic altar had been activated, it would not be long before this place would be filled with Aurors sent by the Ministry of Magic to investigate.
Before leaving the underground ice cellar, Elwyn also went to the room that was previously sealed by a heavy iron door to have a look.
Inside was the ancient water intake system of the Hogwarts, which was still in use today.
In the room, there was a channel paved with bluestone and many modern pipe networks.
Under the effect of magic, water was drawn from underground and supplied to the entire castle through this place.
As soon as Elwyn and Dobby entered, they could hear the sound of water flowing.
Under the light of the wand, he found that the channel was very wide, and the top was connected to the main path of the castle.
The end of the channel extended all the way underground, and it was so dark that he could not see the end.
Unexpectedly, through the water, he could see stone stairs where the channel extended downwards.
This meant that when the channel was originally designed, people could enter it, and no one knew what was hidden below.
Elwyn did not know the principle of the designer, and he had no interest in drilling into the dark underground channel to take a look.
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