Overseer-class ancilla were actually quite similar in appearance to the Monitor-class ancilla designed specifically for the Halo Array, although the Overseer-class was envisioned long before the Halos were constructed. Once physical difference between Overseers and Monitors was the way that Overseers possesed a more fleshed-out shell, and a smaller central eye, which was actually a flattened disk. When charging its only mounted weapon, a directed energy beam, the disk eye would begin to rotate and a ball of light would form in the center. After a number of seconds, this bolt of energy would form a long, narrow beam of white energy. This bolt could do much more than damage its target, but short circuit electrical systems and melt concentrated energy shields. The only disadvantages of using