Tool from Beyond

The Tool from Beyond was a strange machine part kept by Marduk in the Aetherium. It had the ability to open permeable membranes seperating the Aetherium from Earth.

During his trek through the alien dimension, Indiana Jones acquired the part began to use it open up any portal he found to revitalize himself as staying too long in the Aetherium proved to be too hazardous to his health. The portals he opened happened to lead back to certain locations he visited earlier in his adventure: Kazakhstan, Palawan Island, Teotihuacan, Meroe, and Babylon.

Unlike the other machine parts which were lost when the Infernal Machine self-destructed, Indy managed to keep the Tool fom Beyond though it presumably deactivated itself following the Aetherium's disappearance.