Mount Lourneau's Harmony Cavern sat before them, and Andrew lifted his head to take in the sight of the dark, endless tunnel. Nothing on either side looked unusual, yet the pitch-black interior swallowed all light and gave off a chilling, unnatural darkness.

Two martial saint-level apprentices guarded the entrance year-round, and once they confirmed Andrew had come under Roman's orders, they asked no further questions.

However, one of them still warned him, "Sir, the cave is extremely danger