Amber is a block-shaped object condensed from the juice secreted by trees for hundreds or thousands of years, which usually wraps the body of insects. Although the cocoon looks like amber, the production process is extremely cruel and needs to be killed.
The method of making resin cocoons began to spread in the pre-Qin period. At that time, people believed in the art of immortality, and everyone hoped that they could live forever. Driven by this trend, alchemy prevailed and resin cocoons became treasures.
People killed pregnant women in liquid medicine, buried vats in the ground, dug them out after more than ten years, cut open the pregnant women's stomachs and took out the placenta, which became a corpse cocoon after fossilization of amniotic fluid.
There is a huge cocoon on the bronze sacred tree, which is oval, with a pale yellow shell and looks like a round jade. Lao Yang begged Wu Xie to help him revive his mother. According to Lao Yang, Wu Xie didn't have materialized ability until he saw the bronze cast tree.
As long as Wu Xie's belief is firm enough, as long as she thinks about the appearance of the old itchy mother, she can be materialized, and finally she will come back from the dead through the cocoon. To put it bluntly, the resin cocoon on the bronze sacred tree is like a transitional container.