Nazarick Revitalization Plan -Holy War-

Nazarick Revitalization Plan -Holy War- is a game event in Mass for the Dead that was released on February 28, 2020 to March 16, 2020.

Background
Momonga while resting in his bedchambers is deliberating on the various events that have occurred since the Great Tomb of Nazarick's transition into the New World. From the Non-Playable Characters gaining awareness, to the near collapse of the dungeon from the mysterious Rift in the Throne Room, etc. The Overlord cannot help be worried as many NPCs have died and the rest have lost majority of their levels after be resurrected to this world. Nazarick's restoration is on track and their situation is improving slowly, however, the information gleaned from Sebas Tian, Solution Epsilon, Narberal Gamma, Slimeko, and the protagonist are troubling and it's only a matter of time before Nazarick falls.

At a meeting in the Round Table Room, Albedo gathers the protagonist, Slimeko and the Floor Guardians for a meeting called by their master. The Floor Guardians wonder at what the purpose of this meeting is for, a few believe that they will be rewarded. However their thoughts are interrupted when Albedo brings them to order when Momonga enters the chamber. At that moment Momonga reveals critical facts on the future of Nazarick. Despite their hard efforts are rebuilding the dungeon, Momonga states that Nazarick will be likely threatened again in the future. Using a report from Demiurge as reference his research shows that the Chaos Beasts take priority on attacking strong opponents possessing a sense to detect worthy adversaries. Since Nazarick is a place where a great number of powerful beings occupy it, Nazarick will mostly likely be destroyed from an onslaught of monsters. Worse the human nations are also on the decline and maybe a sign that dungeon may face the same fate. In addition there are other threats o consider like beings from YGGDRASIL like the Eight Greed Kings that may still exist. In short if they do not come up with necessary countermeasure Nazarick will fall.

The Floor Guardians are horrified of that reality and argue that something must be done. Momonga agrees as declares that an investigation must be started to determine why Nazarick fell in the first place and how to prevent such a calamity from happening again. Demiurge listening to his master recommends they do a survey on a location he recently discovered: the Roble Holy Kingdom that lies beyond the west of the Abelion Hills which Nazarick's forces have occupied. The nation is said to have lost contact with the other nations after being invaded by hordes of Chaos Beasts. Given the lack of human refugees, its assumed by the other nations to have fallen. It is remote enough to openly conduct a survey and possibly reveal clues on how to prevent a similar fate from happening to Nazarick. Momonga agrees and announces that an investigation team will be formed explore the region. Aura Bella Fiora and Shalltear Bloodfallen are selected, due to the former's tracking skills and the latter's combat abilities. To plan to negotiate with possible human survivors, the protagonist, Slimeko and Solution will be sent under the adventurer personas. Albedo agrees to the selection, but before she announces the command to send out the investigation team, Momon states that another will be joining this team: him.

Albedo and Demiurge are stunned and immediately object to this, reminding him of his safety and station to stay in the dungeon. Momonga argues that his safety in Nazarick is no safer than it is outside not with Nazarick's defenses damaged. Plus the Floor Guardians strength are in a precarious state; should the investigation team come across a player like himself they will most likely be killed. He urges them he must go on this expedition for them and Nazarick. After hearing this Demiurge concedes to his master's decision and also invites himself to the expedition, though Albedo pleads to be allowed to join the team. She is rejected as someone must lead Nazarick in his absence. Albedo understanding the needs gives her consent on the condition she see him off through the safe route to the Abelion Hills.

Battle
The safe route is revealed to be an underground tunnel constructed by Demiurge using various carnivorous hetermorphic beings. The group traverse through the tunnel to avoid detection and to reach the end where magical beasts will guide the investigation party to the Abelion Hills. On the way, Demiurge provides them information of what he learned so far about the area they will be visiting. Aura's hound detects that they are close to the exit so Momonga then casts [Invisibility] and [Perfect Unknowable] at his subordinates insistence while they establish a perimeter and formation as they mount the beasts.

While en-route to the Abelion Hills, the team is faced with little challenge, save for the occasionally flying beast like Giant Beetles. But thanks to the abilities of Shalltear and Aura they manage to reach the Abelion Hills without incident. There they are greeted by the manager of the territory, Evil Lord Wrath. The Evil Lord welcomes his superior Demiurge to the frontier and immediately gives his report of the progress he made so far. Since he conquered the region, the demon has managed to preserve races that are worth incorporating under Nazarick's control. A few working demi-humans like Stone Eaters working in the area notice Slimeko and Aura. Thinking they are food try to intimidate the girls, but are quickly punished by the Evil Lord for their hubris. He later leads the party to more hospital surroundings of a furnished facility. Once Momonga is there he dispels his invisble countermeasures and Demiurge presents him with a handcrafted skeleton throne for his use, much to his master's silent disgust. Once everyone is settled, Wrath, gives his report of the geography of the Holy Kingdom and how it was originally protected by a Great Wall that bordered the Abelion Hills. He manged several subjugated demi-human tribesman monitor the Great Wall, but so far have not reported any humans fleeing the kingdom. Wrath even sent some demi-humans to investigate beyond the wall but have managed to reach the human city on the other side.

Demiurge decides that the will investigate themselves using their party and any demi-human forces they can bring. Momong decides to check the situation at the wall via magic and to the shock the walls of the human city are filled with Chaos Beasts far as they can see.

Aftermath
To be Added...