Also known as: アシュタレト・オリジン
Space Ishtar (Fate)'s Spiritron Dress from Fate/Grand Order. It's a recolor of her Third Ascension form, being more purple and blue rather than red and orange. Astarte Origin also has an echo to her voice.
In Saber Wars II, Astarte Origin was a major antagonist, seeking to destroy the Servant Universe (Fate). She is the leftover body of the goddess Astarte, after she split her personality between the good and evil halves who became their own Space Ishtars.