Bab 563: Chapter 560: Since You Came, You All Must Die_1

Whether it's an Evolution Crystal or Evolution Crystal Core, the power it stores is the energy that allows the creature possessing it to function. In this world, there are various forms of power, such as the work produced when a person jumps rope with their arms and legs, the electricity and mechanical force that operate machines, these are all manifestations of power.

All sorts of machines manufactured by humans require various forms of power to operate, so naturally human beings also need power to operate. Machine equipment needs electricity, gasoline, diesel, or manual power to drive, these are all energy sources that keep the machine running.

So, humans themselves must also require energy to operate. What kind of energy is this? Of course, it's calories! How do you get them? It's by consuming food through our mouths.