“World War III was started by a man who held the power to save the world. He had the
power to save the world, but could not save the world without a right hand to output that
power into the world. That was why he used various methods to obtain that special right
hand. That’s right. You cut off the right hand that only one of can exist in the world.”

-Shinyaku Toaru Majutsu no Index Volume 4 Profound Destruction