Angelic Prison - "During the first great angelic rebellion, there were several seraphim captured alive due to being near impossible to kill. To keep the seraphs under control the halo was used to control the being. On lesser seraphims one halo around the head would serve to weaken the mind of the being making it a effect mind control device. However the more powerful seraphim's could not be controlled by a single halo. These beings would take several of the units to weaken their flesh and dull their mind. Even then they were never fully under control and had to be continually monitored. Additionally it was common practice to mutilate the wings and maim the flesh of captured Seraphim as a mark of their defeat. This process had to be repeated on a regular basis due to their regeneration abilities and could only be done with a omega blade. "