The Function of Crystal Cores

From the appearance of the doomsday merchants in the beginning to the mechanical beings hunting in the Endless Ocean, the purpose of civilization has never changed. They need Crystal Cores, and they need them in large quantities.

Shaun's thoughts went back to what he had seen when the world collapsed in the relic. Although he didn't know how civilization had managed to survive, it must have come at a great cost.

"Crystal Cores... First Generation Civilization... World Collapse..."

Suddenly, his mind shook. Shaun seized upon a crucial point—time. The First Generation Civilization was composed of beings from the previous era. While they had managed to escape the world's collapse, it must have come at an unimaginable cost, with the most critical factor being their lifespan.