C1438 It Was the Stone Door Again

The next few days, the staff were busy assembling machines. Yang Tao was very nervous, he was very eager to get something from the foot of the hill, and he felt that he was getting more and more nervous.

Yang Tao held the jade pendant in his hand. This jade pendant didn't give him any information. No matter how hard he tried, it didn't seem like an ordinary jade pendant. However