Let's talk about: Kingdom Battles.

[Kaimetsu]

This is also a way to balance things. Dustari has 20423 members currently and kingdoms like Zormite have many fewer. If the strength of the armies is decided by your player count alone then Dustari will always have the advantage. Putting NPC characters into the fray lets us even things out.

[TerrorBite]

there is kinda of a way to get units, but summoning is disabled :P anyways yeh Dustari does have a lot of members and without some way to balance things better, it may turn into a world war upon Dustari :P

[AlexH]

It should be made to even kingdom power out like Kai said.
I'm sure there is a way to see how many people are in each kingdom and based on the amount of people in it it should restrict them to the amount of NPC fighters they should be allowed.