Caster-class variant of Artoria Pendragon, introduced during the Fate/Grand Order 5th Anniversary event. First debuted in the second opening of Cosmos in the Lostbelt and is implied to be a major player in Lostbelt no. 6, Avalon le Fay.
She is an alternate version of Artoria who was chosen by the Staff of Selection instead of the Sword of Selection, leading her to study magic instead of becoming a knight. Notably, she does not bear the Pendragon name, unlike her selves from Proper Human History.
Her outfit changes based on her Ascension level: