A Berserker-class Servant in Fate/Grand Order who is the alter version of Mysterious Heroine X. Unlike other versions of Saber Alter, Heroine X Alter retains Saber's iconic ahoge while wearing her school uniform. While her initial appearance is heavily influenced by Master Artoria (along with glasses for extra appeal), her later ascensions make her look more like a Sith Lord from Star Wars, complete with Force lightning and dual-bladed lightsaber.
Gained an idol version for the Grail Live! event.
- First Ascension
- Heroic Spirit Traveling Outfit
- Princess of Red Bean Paste
- Second Ascension
- Third Ascension