C1769 Choose Any Heavenly Materials or Earthly Treasures You Want

"This thing is too hard, isn't it? What material is it made of?! " Yu Fengxiao asked with a gloomy expression.

Ye Hongtian's expression was also very gloomy. Even he was unable to withstand their combined attack just now. However, the door of the treasure vault was completely undamaged after withstanding the attack. This degree of hardness was truly too terrifying