Caster is the Caster-class Servant of Kadoc Zemlupus in the Lostbelts of Fate/Grand Order. She is later able to be summoned by Ritsuka Fujimaru.
Caster's True Name is Anastasia Nikolaevna Romanova (アナスタシア・ニコラエヴナ・ロマノヴァ). The youngest daughter of Nikolay II, the last Tsar of the Russian Empire. Swallowed by the turbulence of the Russian Revolutions, she was murdered at the Ipatiev House along with her family, servants and pet animals.

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