See also: Participation Act, Ministries
Core Worlds are the most active worlds in the Union and together form its government. They may propose laws, but may not vote on them, which is a power left to the Inner Worlds. Additionally, each Core World has executive power in a certain area, which the Core Worlds divide amongst themselves. These positions are called Ministries
Besides this, the Core Worlds can assign two positions to individuals, that of Union Chancellor and that of Vice-Chancellor.
| Member | Description | |
|---|---|---|
| Praetorian Empire | The Praetorian Empire is currently a member of the Union | |
| Divine Fiefdom of Highmons | Divine Fiefdom of Highmons, member of the Union | |
| Astai Republic | Astai Republic is a Inner World of the Union | |
| Veolian Commonwealth | The Veolian Commonwealth is one of the youngest members of the Union | |
| Astrian Colonial Authority | Astrian Colonial Authority is a Member of the Union |