As Yun Zhongzi introduced it, the two boas gave out brilliant lights in the sky while their bodies constantly shrunk. 

Zhang Tie was a bit curious about such a wonderful scene. Although Zhang Tie had seen the world and a myriad of animals on the earth, underground and in water, it was his first time to see two boas changing their sizes casually. 

It appeared that the two boas were completely made of metal. Besides their abilities of flight and changing size, Zhang Tie even felt the rocking four elements. When they expanded, the four elements in the void started to gather up like solid silver secret items; when they shrunk, a part of their bodies would disperse in terms of four elements. 

That was too marvelous. The secrets of life were really endless. 

"Have the two boas been guarding the Dongtian of Great Wilderness Sect since the beginning?'

"Yes, they have!"

"If so, before they were discovered in the Dongtian, what did they eat over the past tens of thousands of years? I don't