Gehenna Project

Gehenna Project (ゲヘナ計画) is a re-enactment game event in Mass for the Dead that was released on April 3, 2019 to April 13, 2019.

Background
This is a story you should have seen somewhere--. Behind Sebas's assault on the "Six Arms" hideout to save the kidnapped Tuare, a plan has begun in which the Demiurge has full control. This night, the flames of Gehenna attack the royal capital.

Summary
At Sebas Tian's mansion, the Pleiades, Mare, Demiurge, and Shalltear gather to retaliate against Eight Fingers. Sebas, not part of the majority of the plan, follows his own agenda the rescue of Tuare, leaves the room for them to discuss their mission for destroying the criminal underworld. Demiurge has Entoma display a holographic image of an individual that is off-limits to all in the squadron especially Shalltear, due to her bloodlust and habit of playing with her prey. Concluding his plan, Demiurge receives contact from a Shadow Demon that an eighth base has been located, and sends Mare with Entoma to go there. Fearing that Ainz might grow weary of the Floor Guardians should they fail him again, Demiurge finalizes the operation and vows that failure is not an option.

Elsewhere, Hilma wakes up from sleeping and finds her manor encased in shrubbery. Behind her stands Mare, who asks if she is the most important person in the manor. Hilma affirms this, trying to affectionately get answers from Mare; but as Mare is relieved to having found her, Hilma is frightened due to Entoma in a corner eating the twitching arm of one of her dead servants. Mare shatters her leg and drags her away by the hair, leaving Entoma to empty the manor of valuables. As Entoma snacks on the severed arm, Gagaran arrives behind her, asking what she's eating; shocked at the sight, Gagaran readies to fight. While Entoma offers a parley, Gagaran cannot do so as an adventurer. When Gagran shatters the ground, loose debris scuffs Entoma's attire; enraged at the disrespect of something granted to her by the Supreme Beings, Entoma fights seriously. She summons Blade Bug and nearly kills Gagaran, but Tia arrives to save her.

As the Blue Rose duo fight Entoma, they have difficulty with her array of insect-themed magics. Entoma replaces Blade Bug with Whip Millipede and overpowers them until Evileye arrives. Evileye offends Entoma for her appearance and says she's weaker than Evileye, causing the insectoid maid to go into a frenzied attack. Evileye frees Gagaran to heal Tia's wounds, as she battles Entoma. When Entoma unleashes a swarm, Evileye seeing her magic similar to that of a Demon God uses [Vermin Bane] and poisons Entoma. Entoma's face falls off, and her lip bug dies, causing her original voice to assert; causing Gagaran to taunt her, sending Entoma with her true form into a blood lust. Gagaran knocks Entoma away, but the clash between her armor and the amid uniform causes her concern. The trio then uses an onslaught of their strongest attacks and spells to wear Entoma down.

With the maid out of stamina and no more bugs in her arsenal, Tia moves in for the kill. But, the a strange red suited masked man appears to save Entoma. After checking to confirm that the maid was still alive, he then turns his attention on the adventurers, his dark aura causing Evileye to become apprehensive with fear as the maid was nothing compared to this being. The masked man tells Entoma to retreat whilst he took care of the adventurers. Evileye, warns her comrades to flee with the utmost haste, but Jaldabaoth attacks and withstands each of Evileye's magic. Using his [Hellfire Wall], he hits Tia and Gagaran killing them unintentionally, even offering condolences to Evileye. He used the spell based on the standard of Evileye's power but is surprised by the difference in their weakness. Enraged, Evileye attacks but is unable to do any point of damage on the demon. Deciding to fight him, Evileye is stopped when Momon arrives, landing in between her and the masked man, and asks which one of them is his foe. Momon ad Nabe who had been flying in the sky via [Floating Board] had seen the scene from above and decided to intervene. As Momon demands to know who his enemy is, Evileye states her name and rank to identify herself as an ally and requests a team up. Reluctant to ask him because of the difference in power to the masked man, Momon accepts without hesitation. The masked named who introuduces himself as Jaldabaoth, accepts Momon's introduction and by the dialogue, Evileye infers Momon is gathering intelligence on Jaldabaoth. Momon being hired by a noble to guard his estate, he learns that Jaldabaoth is currently searching for a item that called to him to this world. An item that he refuses to escape his grasp. When peaceful resolution cannot be met, the two powerhouses clash, which stirs a heartbeat in Evileye.

As they continue Jaldabaoth uses an aerial attack on Evileye, but Momon steps in to deflect the attack. A small parasite breaches his shoulder plate, but Momon brushes it off as insignificant. Momon takes Evileye- fangirling in his arms- to safety as Jaldabaoth falls back to continue his original objective. The demon warns Momon that should he follow, the demonic flames encircling the sector of the city will be the death of him. When Evileye urges pursuit, Momon argues against it as it would mean fighting seriously against a flying demon with incredible power; which Evileye takes as he is protecting her. After Nabe arrives at the manor, Evileye gives a report of their encounter with the insect maid and how she nearly killed her. Both are enraged, but as Entoma survived due to Jaldabaoth's intervention, Momon suggests that the demon arrived because Blue Rose attacked his servant. Evileye in hindsight partly agrees, but as the maid was not as powerful as the demon nor likely aware of the demon's plans, she feels it was still right to battle the insect maid. Momon agrees with her assessment and apologizes. Evileye then internally has the first girlish thoughts she had in centuries since being a vampire.

Momon and Nabe talk in private that, because Demiurge's plan is so precise, the slightest miscommunication could derail everything back to square one. While Nabe is in awe of his planning, in truth Momon only came to the capital by the request of Marquis Raeven to raid Eight Fingers since the reward money was exceptionally high. And since the 'disturbance' was in effect, he would also use the opportunity to boost his own fame. Momon has Nabe message Demiurge as he can't use magic in his suit, and Evileye has her attention mostly on him, thinking it was from his momentary anger from hearing about Entoma. Concluding their talk, Nabe messages Demiurge.

Thinking over the recent events, Momon concludes Evileye is not simply a child with an adamantite ranking. Momon offers to help carry her fallen friends, but Evileye mentions that her team leader Lakyus will be here shortly with her 5th Tier Resurrection Magic [Raise Dead], but the magic would cause her comrades to be unfit for combat for a time. As Momon would like to meet Lakyus (because of her magic), Evileye gets flustered over the idea (making Momon think she is suspicious); he diffuses the problem that he would like to meet a senior adventurer, leaving Evileye flushed.

Princess Renner calls for an emergency summit of adventurers on the mysterious fires encircling a part of the capital. Lakyus reports the fires to cause no damage, and there are demons on the other side. Renner informs the adventurers of Jaldabaoth and his power- using one attack to kill two adamantite adventurers, making the battle against him all the more difficult. Evileye presents Momon to the summit, as he was able to fight Jaldabaoth on a relatively equal footing; leading Renner to detail her operation. Brain, Climb and Lockmeier join a group to rescue civilians. Zanac and Raeven are with Renner looking at her plan, impressed she will be using adventurers as the brunt of the force while having Momon, Nabe, and Evileye as the arrow to pierce through to the center area to battle Jaldabaoth. But the two-point out that Climb is likely to die; Renner is aware of this as if he does, Lakyus can resurrect him, and in his weakened state Renner can keep him close and in her loving care. In affirmation, Renner shows her true face, disturbing both her brother and the Marquis.

Lakyus leads a coalition of adventurers through the flames. Finding them unharmed they come across several homes that have been broken into. Copper and iron adventurers investiagting find the inhabitants to be missing, presumably taken. As the group venture deeper into the area, some of the adventurers wonder on the strength of their enemies. Lakyus informs to those listening that the maid that was with Jaldabaoth was estimated to be around 150 on the adventurer difficulty, while Jaldabaoth was rated as over 200. Upon hearing that a few find it unbelievable and lose hope on the possibility of winning. Lakyus reminds them what Evileye told them, Momon was able to fight evenly with the demon. They should trust that the warrior would be able to defeat the demon, turning on their focus to fighting on foes that they can deal with. Lakyus then continues to lead the adventurers in the streets to deal with the monsters occupying the Flames of Gehenna zone.

Brain, Climb and Lockmeier use the battle of the adventurers and demons to investigate the warehouse area for captured civilians, Brain manages to spot a disguised Shalltear and goes to battle her in order to give his comrades time from the monster. Upon encountering the vampire, Shalltear is unable to remember him due to her resurrection; but Brain takes it as she can't remember him since she views him as insignificant. Brain uses his Field martial art, and Shalltear walks into it, but this time Brain's new mentality from Sebas allows him to aim for and cut her fingernail with Four Fold Slash of Light, a weakened version of Gazef Stronoff's Six Fold Slash of Light. While Shalltear is mildly impressed calling him a "Nail Clipper," Brain is overjoyed, realizing he has reached a new level of strength from having his friends in his heart. He then runs, but Shalltear notices Climb and Lockmeier, remembering the order from Demiurge gave her. So she lets them flee; Brain tells them while hiding that Shalltear can match Sebas in strength, and he successfully cut her fingernail. While Brain knows the meaning of this, Climb and Lockmeier hesitantly congratulate him. Still Brain wonders why Shalltear is in the city, considering that she might be working with Jaldabaoth or perhaps looking for the same thing he is. They use this chance to continue running. Lakyus fights off wave after wave of demon hordes while support mages heal wounded adventurers, but Gazef arrives with the King's personal army to venture in and personally help his subjects. Gagran and Tia, despite the level loss, want to fight to regain their experience and protect those around them.

As Momon, Nabe, and Evileye reach Jaldabaoth, they see his five Masked Demon Maids. While the female adventurers handle the maids, Momon battles Jaldabaoth. Evileye fights Alpha and Delta, while Nabe fights Beta, Epsilon, and Zeta. As Evileye fights Alpha and Delta, Alpha is resistant to her Shard Buckshot and continuously using Orb Shielding to protect herself from Delta's long-range rifle fire. Deploying a mini sandstorm, Evileye is surprised that the Demon Maids know how to team up and reinforce each other. Alpha, unfazed by the sand, finds and attacks Evileye, cracking her mask. Evileye, seeing the two maids she fights are resistant to all her stun attacks, gets airborne to rethink her strategy. As Evileye fights on, Narberal is actually talking with her sisters. Beta, impressed by her holding up, wants to know her name, but Narberal didn't bother to remember. Epsilon recalls her name from the report by Sebas when he was in Re-Estize. Narberal asks if they actively recall names: Solution does so out of remembering specific screams and out of the need for her espionage skills; Beta gets along well with the folks in Carne Village, and Entoma doesn't see it as an issue. Narberal is surprised, but when Mare gives the Earthquake signal, the maids get back to the act and have to injure Nabe to sell the story of the disturbance; apologizing in advance.

Demiurge and Ainz speak in private in an abandoned building to discuss Demiurge's Four-Part Plan. Ainz pretends he only saw three parts (however he was completely in the dark of it all); Demiurge elaborates in full. First Part- covertly steal all the goods and raw materials from Re-Estize without detection to cover for supplies Momon couldn't attain. Second- to mask their retaliation against Eight Fingers, and to place an item of great power with Eight Fingers so the evidence would point to them summoning Jaldabaoth; the Armageddon Evil Statue created by Demiurge's creator. Instead of leaving such a great item, Ainz bestows onto a grateful Demiurge the prototype of the statue for the plan. They will use the narrative thus created by the first two steps to hide their involvement. Third- to take their captured humans from within the capital back to Nazarick for experimentation and other uses; Ainz, while uncaring to humans, orders Demiurge to grant those who show Nazarick and himself the due respect a merciful end. Lastly- to place all blame on Jaldabaoth so as to also boost the name of Adventurer Momon. Evileye regroups with Nabe, and Jaldabaoth is thrust into the scene. Momon, now finally getting to fight seriously, battles the demon. While airborne, Momon uses a fire item, to no avail, and attacks right at the demon, but his right-handed blade is destroyed by Hell Flames. Seeing a chance to use a new weapon, Momon deploys his Frost Pain Modified and nullifies Jaldabaoth's Hell Flames. Jaldabaoth calls for a retreat and wishes to end their battle; Evileye is against it, but Momon agrees. Jaldabaoth insults her intelligence and elaborates that he has his forces to take the whole capital if he can't leave, so his retreat saves lives and he may also be allowed to leave. The demon takes his leave, and with that, the disturbance comes to an end.

Overjoyed, Evileye jumps and hugs Momon for defeating repelling Jaldabaoth. The adventurers and soldiers gather where Momon is and hale him a hero of the Kingdom. In the palace, Climb relays to Renner that those rescued want to thank her, and when she wishes to see those people, Climb declines for a reason, but stops when he notices a moment of change in Renner; the Princess accepts this and moves on. The next day, Momon and Nabe depart for E-Rantel, with Marquis Raeven thanking them for their service. As they leave, Evileye is sad that he must go. Evileye's friends recount how Rigrit humiliated her in combat to make her join. Gagaran then remembers that Evileye can teleport, and if she had gone with Momon in the morning to E-Rantel, she could have established a fast travel point and visit him whenever she wanted. Evileye realizes this and freaks out much to her friends' amusement.

Trivia

 * The scenarios in this game event covers the events from Overlord Volume 06.