The Dome is populated by beings from all of the Regions. However, it has the lowest population of the Regions.
The Dome contains no natural resources, so it depends on imports from the other Regions.
After the Meteorite impact, the Slizer Dome was obliterated, and no one inside was said to have survived.
In the Gryphon Continuity, the Slizer Dome was destroyed like in the main universe. Gryphon later took up residence in the ruins of the dome.