In reality, the bronze tree is real. Unearthed at Sanxingdui site, it is also a prototype in the tomb-robbing notes. A dragon hangs from an unearthed bronze tree. Although some places have been damaged for many years, they have been repaired by many experts. In a word, the bronze tree is an ordinary unearthed cultural relic in real life, and it is not as mysterious as in the novel.
As for the bronze tree described in the tomb-robbing notes, it is actually a sacred tree in Qinling Mountains, and the reason why Wu Xie and others went to Qinling Mountains to look for bronze trees was also a conspiracy of his uncle. His uncle wanted Wu Xie to believe in materialization, which was of great help to Wu Xie's later life.
According to the description in the novel, the bronze tree contains amber, which will make people hallucinate. Some people in the novel will really hallucinate because of this. When Wu Xie discovered the bronze tree, they thought it was a sacrificial vessel, which could be used to capture something called "Candle and Nine Shadows", which is a kind of snake. They all live in the deep underground, and through the introduction of blood, the blood trough of the bronze tree drips down.
It can be seen that the bronze tree is not as mysterious as in the novel. After all, all novels are fictional and unreliable.