The "Eye of Appraisal" of Canaan had zero attack power, but its ability to distinguish truth from falsehood and see through illusions was formidable. It even had a particularly high rate of appraising items whose true nature was hidden behind special energies.
However, after using the Eye of Appraisal, Canaan found that the tunnel before them was empty. There was no crying little girl.
"If it's truly an illusion, then what's with the sobbing we're hearing?" Canaan couldn't help but shrink back, saying to Song Jian, "How about we try another passage?"
Song Jian nodded. They were still in the exploration stage and hadn't figured out the correct path, so choosing a different tunnel didn't make a difference.
If the invisible phantasm-like creature was indeed blocking the right path, they would have no choice but to fight it with everything they had. But they weren't at that point yet.