It is a new level of kingdom.
-Many players are in a kingdom ; many kingdoms are in a superkingdom
-The founder of the superkingdom become the leader of the superkingdom, and his kingdom is the capital
-King invites kingdom to join his superkingdom, and other kingdoms can send application (see below about application)
-If 2 superkingdoms are enemies/allies, all kingdoms (inside superkingdoms) are enemies/allies
-In my case, i want to rename "kingdom" to "town" and "superkingdom" to "kingdom", because i want to have some towns in one kingdom
-Make a chat with the super kingdom allies;
Tell me if it's ok for you and if you need more information about this feature very usefull