At the site of Ravenclaw's secret construction of the tower in the Black Lagoon, in the room where the three arches of the rotunda connected to the pool of blood, Alan Harris gently shook his slender and somewhat pale skin like a dead man, and a temporary round arch stone door meticulously carved with runes closed silently and locked automatically.

In environments where there is no light, forgetting to turn on the lights is a common occurrence for the two wizards with dark vision.

Allen, whose eyesight was not affected by the environment, walked in the direction of the blood pool with ease, and the blue flame in the center of the blood pool made the surroundings a little brighter, making it extremely conspicuous in the dark environment. The humid air moistened his skin as usual, and it carried an uncomfortable smell of blood. Obviously, the flesh and blood that lived in this particular environment began to wriggle due to the presence of the wizard, and their wounds, which could never heal, continued to bubble with blood and tissue fluid.

Ravenclaw had been in the room for a long time, and she hadn't changed her pajamas, but was still wearing the blue gauze dress, the corners of which were like a wave of spray.

Alan stepped forward with a smile and found that the smell of blood had been replaced by a strange scent, and before greeting the witch, he inhaled hard a few times in front of several metal incense burners with incense beside him—and then realized that the smell he had just smelled came not only from the censer, but from the smell of blood in and around the witch, and the mixed smell of hyena leaves and fairy wings burning in the censer—removing the fairy's wings would not kill them, but it would make them very angry with their vanity lovers.

Sensing Ellen's approach, Ravenclaw removed the Mithril Stick, which had been completely corrupted by shadows, from the five-headed dragon stand next to her, and was now covered with the magic words he had learned from the Netharel Scrolls with a spell that Eren had personally carved the other day.

"Don't get distracted. Ravenclaw said to the wizard.

Alan nodded, and he retrieved an empty incense burner from the slump around the witch, then threw a few handfuls of dragon claw powder into it and added the branches of the Protector Tree, a magical Yamanashi tree that would protect anyone who touched its trunk from the dark creatures.

Alan lit them with his fingers, walked over to another corner of the Pentagram on the ground next to the Dementors that didn't hold any creatures, and carefully poured incense ash onto the lines drawn in Mithril - some unappetizing scents filled the air.

Eren could feel the Dragon's Claw powder "lift his spirits" and it would keep him mentally alert for the next few hours. Then, he began to chant the incantation and began the summoning ritual - a creature in the Otherworldly Gate that looked to be a bigger than the average Hellpurgatory was pulled out by an invisible force and locked up in the barrier.

This devil covered in blood - judging by the chaotic power emanating from it, the owner of this blood should be a demon of the bottomless abyss.

"Wizard, where did you know my name, and what do you want?" the devil looked at the confinement circle, and after realizing his situation, he asked impatiently, "Information, knowledge, or treasure?" Tell me, I can finish my errand and go back quickly, I am commanding my troops in a bloody battle and I have no time to ink with you." ”

"I'll be done a little bit, and I think we'll be done soon. Allen, who had already had many experiences in contact with the devil, didn't care about the terrifying evil aura of the other party at all, he bowed slightly to the imprisoned devil and apologized, then raised his palm, grabbed the void, and took the Mithril stick in his hand that seemed to be so black that it was absorbing the surrounding light, and a dementor in the imprisoned circle next to it struggled to fly over, but no matter what, it couldn't get rid of Allen's bondage.

The devil, who is good at playing with words, realizes that the implicit meaning of his summoner's lines is not right with the opponent's movements, so that he directly gives up the negotiation and starts to rush directly towards Allen - and then it crashes into the invisible force field, makes a loud noise, and is bounced back and falls to the ground.

Allen, who believed in the power of the imprisoned circle that he had additionally strengthened, ignored the movements of the Deep Hell Purgatory General, and with a wave of his arm, the Dementor he had caught split silently in an instant without making a sound, and the cloak it was wearing was completely separated from the bones of its body like rotten skin soaked in water, disgusting flesh, and bones, and there was no trace of rotting flesh on those gray smooth bones, and it shone brightly under the blue flames in the blood pool.

Ravenclaw also stepped over to help, using a spell to remove the dementor's remnant spine and remove the excess ribs, leaving only the entire curved spine.

Then the two of them focused on carving the magic text, and with precise magic control, When all the bones and spine were carved, Ravenclaw no longer looked at the skeleton, but turned closer to the pool of blood, and Alan began to control something that now looked like a bone centipede and let it climb up the black Mithril stick, and when it was in the right place, the bone spurs on both sides of the spine that protruded like centipede feet began to close in rows, wrapping the Mithril staff like a tooth comb.

Seeing Eren turn around, the devil realized that something was wrong, and it rushed over again, also failing. Its resentment and malice are endless, and if it does as it wishes, it will jump a thousand times - but Eren has used the Arcane Hand ability to lock the Devil's throat through the air, and lifted it up in the air, allowing the Devil to move to the edge of the Prison Circle, and then used the specially strengthened scalpel tied to his waist to cleanly cut through the Devil's damage-resistant skin and flesh, allowing the corrosive blood to flow out— Under Ravenclaw's control, the filthy, acid-like liquid flowed into a large, characteristic clay water tank.

"Ahem...... Wait, wizards...... Do you want to ...... Leave me alone, I can give it to you...... Anything. The strong desire to survive caused the devil's faint voice to beg for mercy from his locked throat, and then, seeing that the wizard was unmoved, he added, "You know...... My lord Barer won't ...... Leave you alone!"

"Amon, who do you think gave me your name?" Ravenclaw's fluttering voice sent the devil's eyes wide in despair, and the witch continued, "Your master Baier is very similar to you, both started as a writhing and mindless demon, and with his own trickery and cruelty, he finally rose to the position of the Deep Hell Purgator, and succeeded in becoming a devil general. However, he was appreciated by Zariel, the Archduke of Avernas, the first layer of Bato's Hell, for his military exploits, and finally succeeded in overthrowing him in a coup d'état, and then succeeded in becoming a Devil Grand Duke with a unique form - and you have won the attention and vigilance of your lord with your military prowess and prestige...... So I had this collaboration with him, and we each took what we needed......"