Demon Sphere, indeed, it was Frey's Demon Sphere. Even Ji Dong had never seen this Demon Sphere emerge before; it was Frey's trump card that he had kept hidden until now, finally revealed in his quest for victory in the trial. Frey knew Ji Dong very well. He was acutely aware that continuing as normal would offer no chance of success. Therefore, before the preceding battle had even begun, he had deliberately feigned weakness, aiming to make Ji Dong let his guard down. After enduring the first wave of attacks, Frey was willing to take on even more damage in the next round, releasing his own Demon Sphere.