C115 The Second Mission of the System!

"Earth cave? What exactly is that?"

Yang Chen furrowed his brow, unfamiliar with the term.

Chen Tianxin sighed, but explained patiently, "Think of it as akin to a secret realm's relic, but far more perilous."

"Countless demons from other worlds reside within the earth cave. These creatures fled to the earth cave as their own worlds faced destruction, seeking new realms to conquer