The moment the door creaked open Uriel noticed several things. First, he heard an ominous chanting coming from thousands of people at the same time. It filled the room and leaked out through the now barely open door. It wasn't the language or the volume what got to him nor was the malevolence in the air so dense he could feel it, it was the fact that it wasn't the first time he experienced something similar.
'This is what Seiren described as a mind attack.' Uriel inwardly pondered as he looked inside trying to identify the nature of the ceremony being carried in front of him.
There were countless people wearing cloaks of different colors each representing a different element. They also covered their faces in different manners, being the most common a black piece of cloth that covered their mouths, but there were also some wearing surgical face masks and bandanas.