Millius Prime was originally inhabited by the Diathim. During the Clone Wars, the Confederacy of Independent Systems invaded the moon and took it over. They set up a laser field to prevent anyone leaving the system, causing the planetary orbit around Iego to become home to a ship graveyard. The stranded inhabitants of Iego believed the laser grid to be the god Drol.
The Daitham's were a peaceful people as one of the angels said. When the separatist drive the angels from their homes. Millius Prime was abandoned. When the 'ghost of Drol' was destroyed It is assumed the angels returned.