Notice: The beginning of Volume 9 is the continuation of where Volume 7 left off.
Emperor of the Baharuth Empire, Jircniv Rune Farlord el Nix greets the two dark elf envoys to the palace after they kill off more than 100 elite guards in the Imperial Garden. The casualties include one of the Four Imperial Knights - Nazami Enec. Jircniv tries to extract information as well as prolong the negotiation but fails due to Aura's threat to massacre his whole empire if he does not apologizes to Ainz Ooal Gown immediately.
Later, Jircniv along with Fluder Paradyne accompanied by 20 elites guards, then travels to the newly built tomb that Aura constructed with the original purpose of warehousing. On the way, he discuss about resurrection magic with Fluder and finds out that while 5th-tier resurrection magic makes the revived lose vitality (meaning level drop), the Dragon Queen of Dragon Dukedom's wild magic is able to cast revival without the side effect of the vitality loss. The discussion ends when Fluder stated that Wild Magic is a completely different branch of magic, so there is no way to confirm the theory.
Upon arrival, he is astonished at the beauty possessed by the battle maids and the wealth of Nazarick. When they suddenly saw five Death Knights suddenly appearing and form a line, Fluder immediately screams and cause the others to become frantic. Even Jircniv's strongest guard, Leinas Rockbruise, cannot stop trembling. Upon learning the Death Knight's strength and Yuri's confirmation that Ainz has absolute control over them, Jircniv now realizes how powerful a magic caster he's meeting with, while Fluder on the other hand laughs facing the sky. He is even more surprised when he bore witness to many different races gathered in the throne room: dragons, demons, insects, demi-humans, etc while each and all of them seemingly possess significant power. He is actually less surprised seeing Ainz as an undead, since imagining a human ruling over such a variety monster would be strange. After apologizing and blaming everything on Count Femel whose head he brought along, Ainz then turns Femel's corpse into a Death Knight right at the spot. This causes the envoys to feel terrified as he just created a Legendary Undead being right in front of their eyes and with apparent ease. Leaving with mixed feelings, Jircniv calmly assessed the situation in the carriage and suspects that Fluder had betrayed him. He silently seeks to recruit potentially powerful magic casters in the event that he will need to replace Fluder, at the same time seeking to form a grand coalition against Ainz with Re-Estize Kingdom and Slane Theocracy. He also wants to gain an insider spy in Nazarick after seeing so many races in there, as Jircniv thinks that there should be at least one creature discontent with his or her position whom would be willing to leak some information on Nazarick.
Meanwhile, Ainz and the Guardians already saw through Jircniv's plot of betrayal thanks to Demiurge's insight and laughs at how shallow minded the emperor is. Shalltear had suggested to turn him into a vampire. However, Ainz, favoring Demiurge's idea, had a better idea. If Jircniv's intention was to form an alliance with other countries to battle with Ainz Ooal Gown, then Ainz himself just needed to demonstrate to all the consequences of any whom dares to oppose him and Nazarick itself.
A month later, King Lanposa III, along with the royalties and the six great nobles gathered for a meeting as they just received a declaration from the Empire that they are forming an alliance with Sorcerer King Ainz Ooal Gown's country and declaring war for Re-Estize Kingdom's unrightful rule over the territory near Carne Village, that should be return to it's rightful ruler. This cause everyone to be in a heated debate over this mad declaration. Eventually, they simply dismiss it as another excuse for the empire's annual war, laughing at Ainz as just some foolish joke. However, feeling uneasy, Gazef Stronoff warned the nobles not to underestimate Ainz. In the end, the Kingdom still decided to accept the declaration of war.
Two months later in winter, two hundred and fifty thousand soldiers were gathered at E-Rantel. The royalties and top nobles gathered are discussing about their war preparation plans against the empire's forces. Everyone was shocked at the report that the empire gathered sixty thousand soldiers which is three times more than the typical amount of the past wars, and they also received an announcement from Slane Theocracy declaring their neutrality against Ainz. These news caused the nobles to suspect the countries as they were all making such an overreaction over a single magic caster. Due to the ignorance of the nobles of magic, they believed that magic casters were just performers who used tricks such as fire balls and flight in a battlefield. They believed that a single magic spell that could cause great destruction is just a myth. After Gazef's constant warning and persuasion not to underestimate Ainz, they decided to send five thousand men to fight Ainz as an estimation of his power in the war but Gazef still thinks that they are underestimating Ainz. Afterwards, the King ordered Prince Barbro to travel to Carne Village with an army of five thousand to collect information on Ainz while Marquis Raeven was given total command over the army in Katze Plains.
After the meeting, Gazef was still in deep thoughts thinking that it is a grave mistake to fight Ainz in the first place. He then meets up with Brain and Climb, asking them to have a chat with him somewhere in private. After chatting and enjoying the view of the plains, Gazef warns Brain that he will never be able to win against Ainz. Then, Brain also talks about Momon's fight against a strong vampire that appeared, that could be relate to Shalltear Bloodfallen, and wanted to investigate further.
At the empire military fortress, Nimble Arc Dill Anoch meets up with the army commander. They talk about this war being a bloody battle to capture E-Rantel as a gift to honour the alliance between the Empire and Ainz Ooal Gown, while building a friendly relationship. The empire also request for Ainz to cast one of his strongest magic, to determine his power. They then welcome the Sorcerer King's arrival with great hospitality, afterwards Ainz's army was teleported there, and their arrival made everyone realize, with just their appearance alone, that the small army of five hundred is not to be underestimated.
While marching towards Carne Village, the first prince is angry at the king for not allowing him to join the war at Katze Plains. Thinking of his siblings and fearing that he was cast away with the throne being decided by the king already, he then decides to make an outstanding achievement. Thus, he then decides instead to change the objective given to him and instead to capture Carne Village, which is reason the Empire and Ainz start the war with the kingdom. He concluded that he would make the villagers there join his army, and return to the war at Katze Plains.
Later, Enri Emmot was alerted of the kingdom's army marching towards their village. Then the prince's army's messenger answers to Enri's questioning about kingdom being at war with Ainz and demanded the villagers to open the fort gates for further investigation. The villagers immediately accepts that if it is about their savior, then the kingdom must be the ones at fault. Due to their gratitude, loyalty to Ainz and also not wanting to expose the goblins and ogres in the village, Enri still persist on not opening the gates. The prince becaming impatient and angry by Enri's persistence ordered to launch fire arrows at the village as a warning. The villagers still not wanting to betray Ainz while at the same time angered by the fire arrows, did not hesitate to fight against the army, resolving to die.
While the goblins, ogres and male villagers staying as fighters, they planned to lure the enemy army into the village to attack the enemies flooding in first and then distract the ones outside afterwards by thinning their numbers through causing the enemy army to spread around surrounding the outside of the fort . During the fight, Enri would escape behind the fort to the forest with the rest of the villagers. But all this failed when Enri's group escaping to the forest was chased by the enemy soldiers riding on horses. Out of desperation, at the same time desiring to protect the helpless villagers and Nfirea who was preparing to stall the soldiers, Enri blows her second Horn of the Goblin General.
While the dying goblins and villagers made their final effort to fight back, they stopped upon seeing the sudden appearance of an army of goblins, this cause them to retreat back into the ally goblin's army. While the prince felt angry at himself being forced to fight some lowly goblins, ordered his army to continue fighting instead of retreating but was overwhelmed by goblin's army easily, forcing the prince to retreat. After managing to escape to safety at the plains, Lupusregina Beta suddenly appears behind them, claiming to have observed the situation before and has also been send here to kill everyone under Ainz's orders. She then summons thirty level 43 red hat goblins, killing everyone with only the prince dying after half an hour of torture by Lupusregina.
At the Katze Plains, the Kingdom and Empire's armies were stationed facing each other. Many of the nobles still predict that their losses would be minimal even after Ainz entered the war, but this time the empire's army did not make the first move. As time passes, anxiety and tension rises among the kingdom's ranks as both armies on each side remains in stalemate. Thinking that the empire's army was waiting for something, Raeven then started a discussion with Gazef, whom was fully equipped with the kingdom's treasures. But even so, Gazef still thinks that he can't win against Ainz. At that moment,