Serpent of Fate can be obtained by having Cleopatra reach Bond Level 10.
Serpent of Fate is an exclusive CE to Cleopatra.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
EMIYA
Cursed Arm Hassan
1st Singularity: Orleans
Mysterious Heroine X (Assassin)
Medb
Sakata Kintoki (Berserker)
Ereshkigal
Arthur Pendragon(Prototype)
Gorgon
Black Holy Grail (The Black Grail)