Bab 89: Chapter 89: Protect the Book (11)

  'Black hole?' Eero thought. 

          "It is very suitable for assassination since it has very strong fire power and is also a long-ranged shot. You will need to compress the Zi in your body in front of your finger, then you will use it to attract all the world energy around it and from a ball where all energy compresses. Then you just have to release it." 

          "Boom!" a huge part of the mountain in front of the old man vanished. 

          "Although Zi would not cause damage in small amounts, once you compress enough of it, it is highly destructive. That is why you don't just take pills to increase your core level, because it will explode. This technique will even be stronger if you add mana into it." the old man explained. 

          And so, Eero spent the rest of the years practicing the technique and improving his core level. There is no comparison between him during the fight with the abyssans and him now.