"This suggests that the Guardian's mission is related to some extremely terrifying secrets... What is the Heart of the Earth?"
Shard suddenly asked.
"Rumor has it that the Randall Valley is the center of the Earth's Material World, and the Heart of the Earth lies beneath the Randall Valley, represented by the active golden rock in the cave at the valley's center. Some far-fetched rumors mention that whoever controls the Heart of the Earth can control earthquakes, soil fertility, and even changes to the world's entire terrain... Could the secret they are guarding be this?"
Miss Benanis wondered suspiciously, but the others couldn't guess it either, and Shard believed that such a powerful 'Heart of the Earth' couldn't exist. It was likely an exaggerated description, but he didn't rule out the 'Heart of the Earth' having similar functions.
"However, the golden rock..."
