For the Ancient Emperor, there was another rather troublesome factor. 

And that was the fact that the Immortal Art: Immortal Fusing Body Seizing had a time limit. 

He had used numerous items in order to form a spirit design. While the spirit design was triggered, he had to complete his devouring. Otherwise, his partial immortal spirit couldn't maintain the same level of strength. 

In other words, the reason why his partial immortal spirit could be so powerful now and easily crush Wu Yu was because he had absorbed lots of lightning previously. These lightning bolts came from the spirit design, and the spirit design was exemplified by the two vortexes above and below Wu Yu. 

However, there was a time limit to the spirit design. There was a complete flow to its circulation, from the beginning to the end. 

And now, they were nearing the end. If he was successful, it would have ended by now. The Ancient Emperor had never expected Wu Yu to hang on for so long with just a head. 

He knew Wu Yu's devouring technique and ability must have come from the Heaven Devouring Evil Lord, and the technique...