Light skill is the most basic combat skill of all Otto soldiers, which can be used not only by Otto soldiers in the country of light, but also by Otto soldiers in other universes or planets. Light skills are common, but skill damage can prove the strength of Otto soldiers. The killing skills of Otto soldiers are mostly light skills, and powerful energy can directly kill monsters.
Although not many Otto soldiers use it in the plot, this ability is known to all Otto soldiers, and the representative figures are Severn, Chu Dai and Meng Biyou. Remember when beria took the nuclear energy from the plasma spark tower, Taylor used his own energy to protect the little light left in the country of light. At this time, the survivors are three Otto fighters, and they can't change. Then they use Otto's thinking to get the transformed energy from the light in the plot.
So far, the Otto warrior who has used Otto's signature is the only one. When he was trapped by the hippo's Park Jung-soo, he used the beam lamp on his forehead to release Otto's signature, which is the so-called distress signal. Then all the members of the Otto brothers came to earth. Except Ace, none of the other Otto soldiers seems to have used Otto's signature, but other Otto soldiers can also use this ability.