Tatl

Tatl Null, also known as Tael's soul residue out of so many reincarnations he had gone through, and eventually also known as Argalia by the Oracle, was a figure that joined the party midst Black Legion arc to aid the party with her magic skills and her ability to summon Shadow creatures to give either support or damage to the team. Tatl also has been shown being able to use a power related to music with the help of a special Maestro stick, this power wasn't very explored, and it's full potential and use remains a mystery.

It was figured that, due to her overwhelming obsession with being stronger and better then that from which she came from, she manifested the singular, biggest Distortion in the entirety of Caelum - A multi-layered gargantuan tower that bends even reality itself within it, which was shaped and named "The Grand Archives", which is how she began being known as The Librarian of Death. It is likely she kept this monumental capability in herself, or that it was a mix of "Muse", her ability regarding melodies, and the Distortion Factor.

Currently, she is a Hunter of Lucisfear, part of the Second Gen team, probably at Kuon's behest.

Appearance
Tatl is a pretty tall woman with white, slightly curly hair that extends until almost the back of her knees, similar to Tael's extremely elongated hair, with a hairpin of two blue spikes on the side of her head, allowing her to see and fight properly without her hair getting on her face. Upon her extremely petite figure, getting her sometimes confused by a man with long hair, a blue jacket with a cape lays, with several golden adornments, looking quite like a noble vestment.

Ever since her stay in Caelum, and on the Library, her appearence has changed drastically for unknown reasons, but it could be related with the influence of Discens Primae Veritatis in her self, due to their inherent soul-connection. Tatl has short light-blue hair, yellow eyes, and pale skin. In her Librarian attire, she wears a dark outfit with a long coat, a white and black cravat, and heels. Her pendant attached to her cravat is an amber color with the orbs on her heels sharing the same highlight color.

As the Librarian of Death, her appearence is that of a complete dress of black feathers, covering her from neck to feet. Tatl's hair is slightly longer and more unkept in this form, ressembling that of her past self. This was the form Kuon met her on, at the top of the Archives.

Personality
Tatl's personality isn't something that is very touched upon on the entire Black Legion arc, but it is clear she is quite the tomboy and extremely silent. She also shows to be semi-decent with words when she wants to.