11th Seat of the Black Scripture

The 11th Seat of the Black Scripture. She is commonly known as the "Thousand Leagues Astrologer." She is in charge of providing intelligence support to her team.

Appearance
A woman with long blue hair tied with a braid and riding on a crystal. She has an open appearance enough to see her underwear. Her clothes were also described to appear as loose and sagging. She wears an abnormally large hat that hides most of her face.

Personality
The woman seems terrified about the horrible event that unfolded in the Katze Plains, where Ainz used his super-tier spell to massacre most of the Re-Estize's Army. She was described to be a listless woman in nature and does not like the idea of taking responsibility for herself. The type who would rather listen to and quietly follow orders given to her by the higher-ups without resistance. She apparently appears to be viewed by others who met her the first time as a tired woman. In public she walked, in a way which made onlookers believe that she did not want to walk at all or continue doing so.

The Bloody Valkyrie Arc
She, along with the Black Scripture encountered a powerful vampire and tried to capture it but failed. Two of the Scripture’s members were killed, while Kaire received a critical injury. The Captain of the Black Scripture ordered her and the other members to retreat and leave it alone.

The Lizard Man Heroes Arc
She was briefly mentioned by Zesshi Zetsumei when talking about her prophecy of the Catastrophe Dragon Lord's revival with the Captain of the Black Scripture.

The Ruler of Conspiracy Arc
After observing Ainz's massacre of the Re-Estize Kingdom's Army at the Katze Plains alongside the Baharuth Empire, she became a shut-in, staying locked up in her room for an unknown period of time. One of the cardinals from the Theocracy thinks that she has fallen into despair or suffered some sort of shock. Presumably, the cardinal believes she saw something that not even the Godkins may stand a chance against.

The Witch of the Falling Kingdom Arc
Eventually, the Astrologer recovered from her trauma and accompanied her fellow Black Scripture teammates to the Re-Estize Kingdom during the height of its losing war against the Sorcerer Kingdom in order to recruit and save as many of the Kingdom's most talented adventurers as possibly by inviting them into joining and migrating into the Theocracy for their own safety.

The Astrologer in particular accompanied three other of her teammates in negotiating with the Kingdom's two Adamantite Adventurer Teams; Blue Roses and Red Drop's leader Azuth Aindra to join the Slane Theocracy. She sarcastically greeted Azuth with a mocking tone, but only to which the latter counters it with his own much to her frustration. However, when her colleague Quaiesse steps in to stop the two from arguing any further, she simply give up the thought of provoking the Red Drop adventurer any further. Instead, she has decided to listen to his order as given since he is currently her leader for this kind of operation.

Abilities and Powers
She seems to possess some form of surveillance magic from afar, identifying to some degree the number of soldiers Ainz Ooal Gown has under his command. While so, she is able to predict the Catastrophe Dragon Lord's revival.

Quaiesse Hazeia Quintia
She appears to have a close, cordial relationship with the 5th Seat. She was ready to listen to his order the moment he intervenes in a bad conversation with the leader of Red Drop.

Ainz Ooal Gown
During the Massacre at Katze Plains, The Thousand Leagues Astrologer was assigned the mission to observe the battle and gauge the overall power the Undead Sorcerer King possessed. It was an assignment that lead her to having full blown nervous breakdown due to seeing the sheer power of a single spell the Sorcerer King has used. After witnessing the horrific event that have taken place with the summoning and the countless lives lost as a result, she had the sudden realization that even their two God-Kins of the Theocracy might not have a chance of beating him or his forces. Realizing all this, it ended up leading the 11th Seat to isolate herself in her room for days due to the shock, fear and terror she experienced.

However eventually, the Astrologer recovered from her mental trauma and eventually became mentally healthy enough to go on missions once again. As seen where she was able to brave going into the Re-Estize Kingdom in the height of its war against the Sorcerer Kingdom, implying she overcame her trauma to Ainz to a degree.

Trivia

 * In the Web Novel, she specializes in detection magic, being able to see through illusions and accurately judge an opponent's strength. She was also attending the victory ball in Arwintar trying to estimate Ainz's strength but failed as he was shielded. She did get a hint of the power of the Pleiades and Shalltear though.
 * In the Web Novel, the 11th seat was classified as a male.

Quotes

 * (To Azuth Aindra): "To bring whores along, how impressive, old man. This is not a love hotel though~"
 * (To Quaiesse Hazeia Quintia): "Quie-chan...sigh, Quie-chan is the lead this time so I'll just listen to you."