Pa Cheng

The Pa Cheng was a mystical Chinese weapon used to destroy evil spirits. Hidden in the Temple of Kong Tien, it was located and taken by Indiana Jones who used it to defeat possessed Triad fighters and the spirits inhabiting them. He also used it to free Mei-Ying from Kong Tien's control.

Indy took it with him to the Emperor's Tomb and used it to the same effect. While facing Marshall Kai, Indy charged up the Pa Cheng with elemental powers which were successful in defeating the evil gangster. Presumably, Indy donated the Pa Cheng to the museum even though it no longer works.