User blog comment:Nomad27/Predictions of what will Occur in Volume 10./@comment-64.228.198.175-20151117143017/@comment-5480911-20151117184958

The Katze plains by all means already belongs to Ainz...cause nobody really owned it as it was a natural spawning ground for undead.... it was just a convient means for both countries to fight in as it was wide and open and no life existed so collatoral damage would be kept minimum.

As the queen of the Dragonic Kingdom stated only an undead would want to rule it...aka..Ainz himself....I actually think that it is perferct for Ainz...cause since it is a natural spawing ground for undead beasts..it would be beneficial for Nazarick to recruit natural born undead without so much spending any of there magic or resources to create one...i can see them setting up a base to recruit a new undead army. so yeah in addition to Carne. E-Rental, Tob forest and Great lake where the lizarman live the katze plains now belongs to him too.