"Right, right, let's save Ruo Xi first!" Sun Yang nodded hurriedly.
"But how do we save her?" Li Chang'an frowned, looking at the Crystal Ball. "This thing... it doesn't seem like we can just open it."
"Let me try." Shen Qiuyue walked up to the Crystal Ball, raised her Dueling Sword, and was about to strike.
"Wait!" Bai Lin suddenly shouted. "Don't use brute force. The material this Crystal Ball is made of is very unusual. It won't be that easy to destroy."
"Then what do we do?" Shen Qiuyue asked.
"Let me think..." Bai Lin said, beginning to work on his Light Computer.
"Got it!" After a moment, Bai Lin said, "This Crystal Ball can be opened using Energy Resonance!"
"Energy Resonance? How do we do that?" Li Chang'an asked.
"We need a specific energy frequency that can resonate with the Crystal Ball's own frequency to open it," Bai Lin explained.
"A specific energy frequency? What is it?" Sun Yang asked.
