Ye Fan used the Copper Mirror to trace Xi He's tracks. Although Xi He was well-disguised and hidden, Ye Fan possessed the ability to communicate with Spiritual Bodies. He could determine where in the Pan Gu Secret Realm there was another illusion through investigating the density of Spiritual Bodies.
"Master, how did you determine Xi He's position?" Su Nu asked.
Ye Fan said coldly: "Xi He set several illusionary traps for me in the Pan Gu Secret Realm, making me think Zhao Jun and others were imprisoned in those places. But she is actually hiding in a cave, because beneath the cave under the Death Sea, there remains an illusion left from the Middle Ancient Era. The scale of this illusion is unique in the entire secret realm. Xi He wants to create illusions in the cave to blind my sight!"
