A new item had appeared in Eren's inventory that only he could see. At the initial impressions, the item appeared no different than a wooden mask which wasn't even something that could properly be worn.
It was too small to be of any use, merely being a few inches long. It was more like something that could be used to make an accessory for a pendant than a proper mask.
With the Left Guardian nearby, Eren couldn't bring the mask out of his inventory to check its uses. For the time being, he silently followed the Left Guardian with the support of Ruby.
Soon, the left guardian stopped in front of a large metallic door. She opened the door and told Eren to enter.
"What is this place?" Eren asked, frowning.
"You ask too many questions..." The Left Guardian simply waved her hand, using the controlling force to pull Eren's body.
Eren's body flew straight inside the room, Ruby following closely behind. The moment both of them were inside the dark room, the metallic door closed.
From outside, the left guardian's voice came, "For now, you will be staying here. After we confirm what happened in the Kiel Family Estate, we will think about how to deal with you."
The left guardian turned around, not offering any further explanation.
From inside the room, Eren heard the sound of footsteps getting distant. They were truly left behind in this room, which was truly no different than a prison cell.
The walls were made from anti magic material. Even a powerful mage couldn't break these walls, let alone people from other Continents.
The metallic door was even worse. Eren simply touched the door and he felt as if his strength was being sucked by the door.
If he was to attack the door, he was sure that the door wasn't going to break. If anything, the door was going to steal his energy, maybe even use it against him.
He confirmed his theory with the use of Identification Skill on the door, only to realize that everything was just as he expected.
"Just as I thought, this was a trap." Eren walked back and sat down, his head still a little dizzy from the use of the portal formation.
Under his breath, he chanted a few words to use the Dragon Tongue Language, accompanied by the ability of the Hero Academy Professor that he had stolen in the Hero Continent.
With the hero's ability, he started manipulating her memories. With the girl being so weak, he didn't have any problem when it came to the mental manipulation.
With the Dragon Tongue, he reinforced the effects of his abilities, creating new memories for the girl to believe in.
Now that he was in the Necromancer Tower, anything was possible. His biggest weakness here was Ruby, who knew his real identity.
Previously, she barely controlled her fear and wasn't interrogated by the left guardian. It was quite possible that next time it might not be so easy for her.
He made sure that Ruby believed the story that they had told the Necromancer Tower.
He even erased memories related to Fey, manipulating them to make her believe that it was actually an ordinary meeting in her family which was attacked by someone who looked like the Cardinal.
"That should be enough." After completing the manipulation, he walked back to his place and sat down.
He had taken care of the most basic things. Now only the important pieces of this puzzle were left.
....
"The left guardian is coming here?"
"What? What did we do? Why is that monster coming here? Did you offend her somehow?"
"What do you mean? It must be you who offended her! Remember the time she brought back an adult Mythical Beast Corpse after hunting it? She must have found out that you failed to reanimate the corpse of the beast!"
"How could she find out so soon? Argh, I am dead if it is true! I need to hide!"
Inside a hall, there was absolute panic as the news amidst the members of Hall of Life and Death.