From an outsider's perspective, Michael's entire body was as natural as the paint on the wall. If they looked directly at him, they would notice nothing and simply thought that he was part of the wooden ceilings up above.
His mastery over mana allowed him to be completely devoid of it as well. There was no Light mana emanating from his body, mistaking him as a non-living being, as an object.
Of course, he could have just used the Orcs' Shadow Skill to obscure himself, but he thought that this was a better stealth option overall.
"We have arrived here to solve the situation. And solve it, we will," said the hooded figure.
Thanks to Narito and Sasuki's timely report, Michael was able to witness the arrival of the hooded figures in the City.
"Any idea who they are?" he asked the Orcs, using the 2-star spell [Variable Sound] to transform the waves of his voice into a straight line that directly transmitted the sound to their ears without any leakage.