The more Arthur followed Tessa, the more strange the entire situation became. She was the daughter of a duke, a rank-three vampire mage, yet that was not a motive for her to have so many contacts inside the castle and to act behind the back of the rank-four vampires in charge.
She was plotting something, but for Arthur to know, he would have to learn more about the situation. But, with his current level, it would be hard to follow her through the secret passage in that library, but doable if he did everything correctly.
"There has to be something," thought Arthur, looking at Tessa and the other vampire talking inside the library.
Then, the vampire took out a robe with a mask from behind the counter and gave it to Tessa. It was a blue robe with a hood and a golden mask that covered the face entirely.
It reminded Arthur of the Doom Order, but that order had disappeared long ago, which did not mean another type of order could not appear.