Otto von Guericke’s Magdeburg Hemispheres

Origins
Otto von Guericke was a scientist who implemented research into the physics of vacuums and did early research into electromagnetism.

Collection
It was stolen one night from the Deutsches Museum in Berlin and replaced with a replica.

Effects
When released of all air inside, the pressure builds to proportions equal to several atmospheres of force. Meanwhile, the surrounding area outside the spheres turns into a vacuum, devoid of all gases including oxygen. Those that step into the field pass out from lack of oxygen within a minute.Also, the spheres are extremely durable, with the combined force of twenty horses unable to pull it apart. It can be deactivated when someone prys the hemispheres apart. When this happens, however, it creates a force equal to and sometimes greater than the pressure that was previously in it.

It is best recommended to just hit the artifact with a rock when it activates, from far away.