Aureole Omega

Aureole Omega (オーレオール・オメガ) is an Area Guardian of the Cherry Blossom Sanctuary and the leader of the "Pleiades Seven Sisters", the battle maid squad of the Great Tomb of Nazarick.

She is in charge of the Teleportation Gates in Nazarick and protecting the Staff of Ainz Ooal Gown in the Cherry Blossom Sanctuary.

Appearance
Aureole Omega wears the traditional attire of a miko which includes a pair of red hakama (long, divided trousers) and a white haori (kimono jacket).

Personality
Solution knowingly sees her sister, Aureole to be a rational person, since she wouldn't have came to the same decisions as Sebas did. Her sister, Yuri Alpha describe Aureole as someone who is high-spirited. Yuri has also imagined the thought of Aureole crossing her arms with an adorable smile on her face.

Background
Aureole Omega is the leader of the "Pleiades Seven Sisters" and the Area Guardian of the Cherry Blossom Sanctuary that controls all the teleportation gates in Nazarick. She is the only human NPC of Nazarick that possesses eternal life.

The Emissary of the King Arc
When Ainz sent out his Death Knight to interview each of the Floor Guardians, Aureole Omega noticed its presence in using the Gates. Seeing that the undead wasn't an enemy, she allowed it passage.

The Men in the Kingdom Arc
Ainz switches the Pleiades from the Six Stars to the Seven Sisters. While so, Ainz does not allow Aureole Omega to move from her current position and thus, Yuri Alpha becomes temporary leader of the Seven Sisters.

The Two Leaders Arc
When Nfirea, Enri and Nemu were teleported to the the 9th Floor during their visit in Nazarick. During the transition, Enri briefly caught a glimpse of Aureole Omega.

The Pleiades Day Arc
Yuri Alpha contacted her youngest sister to confirm the location of Shizu Delta who was on the 6th Floor of Nazarick.

The Paladin of the Holy Kingdom Arc
To support the summoned Evil Lord Wrath and Erich String Orchestra in their upcoming battle with Ainz, Aureole Omega was ordered by Albedo to buff the five Greater Doppelgängers who took on the form of all her Pleiades sisters except Narberal Gamma beforehand.

Abilities and Powers
Aureole Omega is in charge of overseeing all the teleportation gates in the Great Tomb of Nazarick. If an intruder attempts to enter through it, she will use some sort of unknown portal to teleport or divert the intruders into the isolation area of her choice. When Ainz switches the Pleiades from the Six Stars to the Seven Sisters System, she is now the leader of the Pleiades.

Like Pandora's Actor, Aureole Omega is also a level 100 Area Guardian. She specialized in commander-type classes. As a commander, she could issue orders which buffed her allies like CZ Delta. Thanks to Aureole Omega, CZ Delta is able to overcome the level difference between herself and Ainz to the point that she can successfully interrupt his spell casting twice. Ainz viewed Aureole Omega as a wild card and an all-rounder.

Active

 * Gate: Summons a portal, allowing travel of a large number of people over great distances. It is considered to be the highest tier of teleportation magic.

Ainz Ooal Gown
Aureole is entrusted with the protection of the Staff of Ainz Ooal Gown in the Cherry Blossom Sanctuary when it is not in the possession of her master, Ainz.

Yuri Alpha
While the two are sisters, they still maintain a cordial relationship when carrying out their master's order. Reasonably, she is willing to help out Yuri on the job, lending the maid her own minions for assistance.

Albedo
Albedo is likely her superior as the Overseer could recruit Aureole Omega to help her on buffing the Doppel-Pleiades before they begin battle against Ainz.

Trivia

 * There is an unknown female NPC in the picture of all 100 level NPCs in Nazarick. As the NPC's clothes is similar to that of miko, it was implied to be Aureole Omega in such attire.
 * She is the original owner of the World Item in the 8th Floor that was given to Shalltear Bloodfallen.
 * Her name is finally revealed in the bonus booklet of the Overlord Movie, The Undead King.

Quotes

 * (To Yuri Alpha): Yes. When Ainz-sama graced me with his presence, I received permission to send up to two of them outside the Cherry Blossom Sanctuary at any one time.