Wu Yu focused on it. The item that floated before the Void Bird was a rich grey color - a stone lock.

The Void Bird shielded the stone lock from Wu Yu's view with her wings. At the same time, she activated the spirit design on the stone lock. In that instant, the space around them changed.

Evidently, this was a type of spiritual immortal treasure.

The Immortal Treasure Spirit Design on the spiritual immortal treasure, under the activation form the Void Bird's eighth tier Yaodan essence, very quickly showed its effects.

From the Void Bird's exclamation, it seemed like she had long prepared this. She had been waiting for his arrival with the stone lock spiritual immortal treasure.

Wu Yu did not make a move. He knew that since his opponent had been well prepared, then she would not let him leave speedily.

As expected, when the stone lock triggered, a perimeter of 50 kilometers was caged in an invisible sphere. This was a solid, sealed sphere. Whether flying up into the sky, or burrowing deep into the mud, after 50 kilometers, one would collide...