They were nothing else but shackles for both hands and legs. Seeing them, Apollo immediately remembered the weight training in many anime and manga, but he didn't say anything, as he was waiting for the explanation.
"You should be confused seeing them, but they are not ordinary items."
"The shackles that you are seeing are made from 'Hell stone', a very rare and precious stone that is used to suppress powerful people."
"The Hell Stone had a very powerful ability to absorb any kind of energy in the world. It can absorb life force, mana, or even death energy."
"It consumes energy like a voracious beast, rendering even the mightiest individuals in the limit-breaker realm powerless against it."
"And now you are going to wear them 24*7, whether you are eating, sleeping, or taking a dump; you have to wear them all the time."