|Appears in:|| Fate/Extella|
|Japanese VA:||Mamiko Noto|
|Character type:||Servant (Master: Protagonist)|
Saber's True Name is Altera (アルテラ, Arutera?), the King of Combat (戦闘王, Sentō-Ō?), better known as Attila the Hun (アッティラ・ザ・フン, Attira za Fun?). She was a great king and hero from the 5th century who was descended from the Xiongnu (Hunni). She was a Hun tribe warrior and king who established a great empire, a vast territory spanning from West Asia to Russia, Eastern Europe, and Gaul. Although she displayed great deeds of arm on the battlefield and could said to be the one who brought about the collapse of the Western Roman Empire, her success in her rule failed and her empire quickly collapsed and vanished completely after her death. The name "Attila", exemplifying awe and fear, is still remembered to the present day despite that.
She has white hair and red eyes.
Saber displays outstanding power of intuition, able to stand against all circumstances without abandoning her reason. Although a proud and rational warrior, there can be said to be an "emptiness" within her. As a King of Combat, she turns into a combat machine in battle able to calmly and accurately take grasp of the situation and execute a merciless massacre. She has an innate compulsion to destroy that she describes as being even greater than that of a Command Spell.
Her wish, if she can be said to have one, is "I want to try living a life other than that of a warrior". It is not out of disgust for her self as a warrior, but a curiosity as to the life she would lead outside of battle. She has held a liking for the war god Mars (Ares) since she was born.
Lev Reinol Flauros summons Saber in Rome after he is defeated, but she quickly cuts him down.
In Fate/Extella, she has an enhanced version of her Noble Phantasm titled Teardrop Photon Ray: Star of Tears, Sword of the War God (涙の星、軍神の剣, Namida no hoshi, Gunshin no Ken?).