To the inhabitants of his Cave Heaven, it looked like the world was ending and the sky had come crashing down. They were wrong, of course. But for many of them, it didn't matter if the world was about to be destroyed because they were going to die, and whatever would happen to the Cave Heaven would no longer have anything to do with them.
Most of the living things in his world were weak. This made it so that the average lifespan he gained from the was one month each. So he needed to kill and devour 120 million living things to get 10 million years of lifespan.
He had a total of 680 million living things living in his Cave Heaven, so the 120 million living things that he ate made up 17.65% of the inhabitants of his Cave Heaven. With this many batteries on hand, he felt confident about his next plan.
