It is a shield that is surrounding and protecting the center of the Milky Way Galaxy. All the civilizations know what the Cronosians plan are, and that is to harvest all the energy from the black hole, located at the center of the Milky Way. This will lead to a total catastrophy across the galaxy. Planets are losing energy, and also stars, light go off, and it will mean the end of an entire galaxy. They want to use this energy to build a stronger force to travel to the other universes to take over the galaxies to other civilizations living in other universes.
It was the Alverian civilization that discovered this machine the Cronosians are constructing. They also found some evidence when the Cronosians where for millenias ago were part of the Universal Military Alliance(UMA).
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