Its probably a set up like the holy kingdom.

Nando, yeah I know since in Volume 10 Albedo was talking about the famine but was just wondering like how everyone of the characters within the Kingdom will react will the Slane Theocracy join in or will the Platinum Dragon Lord join since he have ties with Evileye something among this line

Unfortunately the writer is shortening the series to 17 volumes, I hope he's joking an is still doing the 20 volume. If he does this I dont want anymore volumes , 20 is enough. And that man needs sleep.

Yep he does but hey I wonder what’s next will he continue working on the side story cause that one was very interesting

Here's my theory:

Plot

We will gain some plot within reize kingdom (Golden Princess, Climb, Brain, blue rose, Marquis R) few dialog then the golden princess end game and also some ST dialog involved the growth of the SK, and I think few of the character in the reize (more main focus character) will prob have some help smuggling out of reize to relocate and train up until the last overlord major war, don't know which territory they be smuggling to tho. SK plot side will prob be more focus with ainz and his floor guardassassinated by the golden rick as a whole. Since ainz is conflicted with his human side and his undead morality. We might get little something on how nazarick see ainz a little bit different but that might not happen.

Battle and Endgame

SKingdom is going to starve out the reize kingdom not allowing merchant to go in or out of it border, totally lock down, few battle with blue rose commanding a scout unit or seek and destroy unit in their own territory(against mostly of POP monster) and 2-3(the most) blue rose will die. Rezie king might surround or assassinated with his son by the golden princess.

P.s I'm sure there more to added but if the time giving to me this is what I came up with.

I think Demiurge's plan is simple: destroy the kingdom, even make it ashes.

The point is to demonstrate "the carrot and the stick", the empire overflowing with prosperity and make the kingdom an example.

But Ainz enters esena and prevents this from happening, or rather he just does what he wants and changes his mind at the last moment.

Instead of sweeping the entire country, he simply eliminates the "powerful forces" that oppose him (Blue Rose and nobility,) leaving the people in general alone. This to be congruent with the arch of the Holy Kingdom.

I think that it wouold follow as this:

1. The incompetent fraction of nobles is struggling with food and other supplies (even earlier than expected because they are idiots who don't know how to manage their territories)

2. The incompetent fraction asks for help, the Kingdom does not have enough resources to spend (they may even have given some already, but they were simply wasted). Then the sorcerer kingdom is put into action to help.

3. As in the sacred kingdom, people begin to idolize Ainz. This enrages the nobles of both factions (Noble and Royalty), who see this as a passive way of taking over the kingdom.

4. The nobles who try to prevent help from arriving, end up attacking a supply cart, but it turns out that Ainz or some emissary was inside and not just supplies. Leading to the wrath of Ainz and a just cause for war. (probably the noble faction)

5. Other nobles (Royalist) fearing that being separated will leads only to the Sorcerer's kingdom conquer them faster, join in a common front. The nobles probably don't expect to be able to win, but if they put up a good resistance hope they can make some demands.

6. Sorcerer Kingdom wins overwhelmingly simply by maintaining a defensive position. Ainz believes that it is better not to invade cities and hopes that the other party will negotiate their surrender, in contrast to Demiuge's original plan for devastate the whole country. (Demiuge praises Ainz at the thought that he is injecting fear into the hearts of humans).

7. The climax of the story comes with a joint attack of all the relevant forces (warriors mithril level or higher). This plan is orchestrated by Renner herself and allows Ainz to eliminate all resistance and meet the former heroine Rigrit Bers Caurau, so Ainz can extract information about the players.

8. The volume ends with Renner and the king bowing to Ainz, then Renner expresses that he can do whatever he wants with her and nobles but plea for him to allow his people to live. Ainz only says he wants the surrender of the Kingdom, Renner inherits the throne (only remaining royalty) and subjugates himself to the sorcerer kingdom.

That a great detailed theory and to tell you the Truth can’t wait to see the Fate of Philip the foolish one lol

Toy with by NPC most likely. We will prob get more info and interaction with Red Drop adventurer member and blue rose leader uncle and that item they have.

This is all planned as prediction of Ainz. Why? he could make the excuse that Re-Estize was the first declare the war to Sorcerer Kingdom and he could do counterattack (actually it was planned). So he was not seen as a bad person by another country first by plotting his fake death. And remember with noble named Philip? Yes, he planned to attack Sorcerer Kingdom to sit on the throne and marry with Albedo. So that's why Albedo let him live, for this plan. So the plan can run with smooth