"Tarnished, are we? A wonder you should turn up here. I am Sellen, a sorcerer, quite plainly."

A former scholar of the Academy of Raya Lucaria. Sellen was considered to be the Academy's most promising sorceress, however she was expelled following accusations of unspeakable treatment of her fellow scholars, under the name of the Graven Witch. Sellen had sought to restore the Primeval Current, desiring glintstone sorceries unbound by terrestrial taboos and the pedantry of the Carian Royal Family.

Sellen's first teacher at the Academy was the sorcerer Azur, one of the founding glintstone sorcerers and originator of the Karolos Conspectus[5]. Azur, along with Lusat, was banished from the Academy due to their study of the primeval current, a pursuit Sellen wished to follow.

Sellen was also an acquaintance of Preceptor Seluvis, and a frequent visitor to his underground cellar, where he kept his collection of puppets. When Sellen was expelled, Seluvis helped her in some capacity, for which she owes him.

At some point following her banishment, Sellen was imprisoned in Witchbane Ruins on the Weeping Peninsula, bound by the Academy's shackles. She managed to manifest a projection of herself in the Waypoint Ruins in Limgrave. It is here that she meets the Tarnished, who becomes her apprentice, learning glintstone sorceries from her. When she learns that the Tarnished has found Master Azur on Mt. Gelmir, she requests that they seek out Master Lusat, speculating that he returned to his home of Sellia, Town of Sorcery. The Tarnished discovers Lusat, in a near-inorganic state much like Azur, in Sellia Hideaway, and reports back to Sellen.

Much like Ranni the Witch, Sellen's fate is tied to the stars, and with the defeat of Starscourge Radahn, Sellen becomes dispossessed of her immortality. This makes her a target of Jerren, a friend of the Carian Royal Family who once made a promise to exterminate the witch. Sellen reveals to the Tarnished that the form they have been speaking to is a projection, and that her true body resides in Witchbane Ruins. The Tarnished meets with Sellen's true body, shackled in the ruin's cellar, and she asks them to remove her Primal Glintstone, beseeching them to look after it. Jerren arrives to find Sellen's previous body already perished. The Tarnished later places Sellen's Primal Glintstone into a puppet in Seluvis's basement, which bears a striking resemblance to Sellen's old body. Sellen, now in her new, more youthful body, returns to the Academy and displaces Rennala, Queen of the Full Moon. She has the bodies of Azur and Lusat moved back to the Academy, so that she can finally hone the Primeval Current. She offers her support to the Tarnished in their mission to become Elden Lord, and requests that when the time comes, they illuminate her about the secrets of life which course the Elden Ring Before long, however, Jerren finally catches up to her. Should the Tarnished aid her in beating back Jerren, she will continue her research. When the Tarnished next sees her, she has transformed into a Graven Mass.