I advise you to watch first the anime overlord or read the light novel before reading this fanfic

English is not my mother tongue so yeah sorry if there are any errors

I do not own overlord

97th floor or the Perganum

After three hours he stand up and change his outfit to a jet-black academic gown and teleported to the 97th floor or the Perganum. He is in a large dorm room and before him are two massive obsidian doors that have a sigil of the Yggdrasil tree on each door. And guarding that room are Ten Al Malaikah Angels of Perganum. He create them because Ainz is a fan of all kinds of angels and demons in many religions.

They kneel in front of him and said

"""Greetings supreme one""" the ten angels kneel and bow

"Umu" He went to the door and the two angels Gidram and Izrail open the obsidian doors for him. This is the royal library of the Tower and all scrolls, books, and potions in Yggdrasil are here in this massive library.

He sees first are many art pieces, paintings and decorations on the walls of the Perganum. In the ceiling are chandeliers that have many precious stones that light every corner of the room. In addition to that, there are paintings of gods, angels, and demons on the ceiling, they are very detailed and if one will see them one will think that the mighty beings in the paintings will come out and destroy everything.

On the ground is a black marble with a red carpet leading to thousands of sections of books in this royal library. He look around and see a thousand level 75 skeleton mage wearing white hooded robe cleaning the books or checking if all is in order in the Perganum (Royal library). An undead walk in front of him and kneel

"What can I do for you Supreme one?" Titus said

He is Titus Annaeus Secundus the guardian of the 97th floor. Ainz transfer him on this floor and turned him into a Level 100 Overlord Wiseman. He has two horns sprouting from his head, four bone fingers, and two hoofed feet. He wears a red gown with silk covering his head. His body is adorned with many accessories that are all-powerful magic items. On his arm is a bracelet that has seven jewels on it, a golden amulet around his neck, many different rings on his fingers.

"Oh Titus, I am searching for government-related books, all summons of all races in Yggdrasil, and military-related books"

"Yes milord we will bring them for you... Oh Athena the supreme one has an order for us"

A beautiful woman walks elegantly into Ainz and kneel.

"Ainz sama greetings. it's nice to meet you in this place of wisdom"

She is Athena the vice guardian of the 97th floor and in charge of experimentations, researches, and making of different kinds of high-tier scrolls. She is an immortal human with angel wings in the back that adds to her goddess beauty. She has many accessories that are powerful defensive magic items to protect her from her experiments or her researches.

"Oh Athena, Before I forgot go to my office room on the 100th floor in one week time Because I will give you your new assistants to help you with your researches and experiments"

"Understood Ainz-sama"

"Umu I will be there at that table, and no need to rush because I can wait." He point at the table and seat there

""Yes master!""

They leave with one hundred undead mage in them to help them search for the books that Ainz wants

(I feel I need to be specific when I said the books that I want... There are almost five million books in this library...)

[Base on the assumptions milord yes they might bring thousands of books to your table...]

After one hour two hundred skeleton mages wearing white robes bring tons of books. Ainz stare at the tower of books and it just keeps adding and adding. When they are done, the books occupy ten wide tables.

"H-how many are the books Titus..."

"two hundred thousand books my lord"

[Confirmed theory]

(AHHHH!)

Ainz start with the Heteromorph race and get all races that are useful for his new empire. He will summon them by using the [Nature deity class] the [Life giver] so that the living summons can stay in the world and not disappear like summons, but he can cast it (1,000/1 month).

He now collects ten books on government-related topics. And he order Titus to find a construction manual for Airships and sea ships. He is reading a book called "The three important branches of a government" But an [message] interrupted him

[Message: Darling there is a problem here in heaven. On the horizon, an unknown castle-like ours but a bit shabby suddenly appear] Angela said in a serious tone

[Message: Husband there is an attack on the underworld. We can kill them but if you want to question them my lord then I personally hold them] Darkness spoke

(We've been here in this new world for a day... A DAY DAMMIT WHY! it's great that I rest because if not then I will explode) He cries inside and he calm himself after

[Angela order Jehudiel and other overlord angels to gather the high angel corps. I will send the ten Archangels of the Sephira to guard the hidden garden] Ainz message to Angela

[Yes my lord!] Angela said

[Darkness take Beleth, Purson, Vine, and Balam and hold the attackers. I will go thereafter I went to the throne room]

[Yes husband] Darkness said

He stand up and look at Titus and Athena "Titus, send these books to my room. Athena activate all Guardians of Knowledge here on this floor and lockdown the library"

These Automatons are considered the Guardians of Knowledge a spawn NPCs that are only found in the walls of Perganum. They have stone bodies that have countless runes and has golden edges. Yellow electricity connect every part of this automaton and a yellow glowing orb in its chest is protected by two rings that rotate rapidly that creating a barrier on the core. They are armed with a strange staff that has a yellow glowing orb on it same as their cores.

""Yes Ainz-sama""

Throne room – 100th floor

He teleport to the throne room first and there he see albedo standing near the throne. He went there and seat at the obsidian throne

"Albedo raise the alert of the tower, heaven, underworld, and the kingdom to level ten. Send Ten Archangels of the Sephira to the hidden garden to guard it"

Albedo look troubled at what Ainz order but she composes herself and a screen appear and she activated the Alert level ten. After that she message the Angel guardians and she send them to the 'Heaven'

"Are we under attack Ainz-sama?"

"Yes the underworld is under attack and the heaven see another structure that we didn't know"

"The supreme golems are now activated on all floors. And the angel guardians are on the hidden garden right now"

"Very good I will go now. Message me if something happens on the other floors" He stand up and about to teleport to the underworld but the level 100 Seraph Empyrean and level 100 succubi demons or his royal guards kneel in front of him and said

"""Supreme one let us accompany you to be your shield. That is our purpose, to give our life to you. so please let us serve!"""

Albedo nod and said "Yes Ainz sama we don't know what happened in the two realms so I advised that you bring your royal guards" Albedo said

"Umu lets go now"

[Mass Guild Teleportation!] Ainz and his royal guards now teleport to the 'Underworld'

The magnificent story overlord is not mine but the OC yes.

Please leave any advice to improve my writing skills

I am not good at English so sorry if there are some wrong sentences, descriptions and use of words

Hail to Emperor Ainz Ooal Gown