I suppose I should clarify that nothing here is finished 100%. Like the angel enclave has been moved to Liveria, because I felt there were too many rescue missions. Also, Amazonia is no longer terminated society. (Poor wording on my part. I didn't mean total annihilation, I meant as a nation, they would no longer be a power player.)

Also, to clarify further so you all have more to go on from the Word of God.

Each nation brings something potent to the table. Like to counterpin the "Imperium is weak" bit, note they have two things going for them. First, the immortal regiment, which is basically the remaining 10,000 year old badasses that refused to stay dead. They operate like a single entity. Put them on a line and it will not fall. They are the immovable object for all concerns. Secondly, they are highly adaptable. They lost the colonia because they lost the magic war. The response? Go pursue one of the most powerful magical artifacts in the world so they can stop that nonsense.

Amazons? Potent shock troopers--including blood mages--and ambush predator tactics. What they lack in number they make up for in skill.

Tuleria? Lizardmen, which are basically 6-8 feet tall muscular juggernaut troops. By the thousands. They also have access to firearms, specifically cannons, which are very useful artillery.

Free Holds? Sheer irreducible numbers that they use to pin enemies down before their highly paid specialists lay waste to a battlefield. Technically speaking, toe to toe, no other nation in the world could win against them. Even Rheinfeld's inquisitions do not get far. The problem is uniting them since they constantly change leadership.

The only reason the Goblin Holds is doing as well as it is is because the Free Holds saw the imperium as a greater threat. Xixis is however an extremely potent mage, and what the goblins lack in raw power they make up for with ingenuity. Stuff like mastering the Asimov Worms.

Every nation brings something very potent to the table. Don't write one off out of perceived weakness.

As well, something that seems utterly horrifying can still be salvaged. Some nations you help will have the incentive to aid the ones around them if they get in trouble.

Finally, keep in mind geography. The more demons can streak havoc in a nation, make it unstable, the more likely they can start an invasion from that location. Some locations will naturally last longer than others in terms of resisting the invasion, corruption, etc.

The ultimate goal should be to keep as much of the world going as possible and contain the threat. Writing off the northern half of the world to a force that quintessentially has infinite numbers of disposable people to throw at you is unwise.