Caster (Fate/Grand Order - Testament)

Caster (キャスター) is a Caster-class Servant appearing in the Grand Orders of Fate/Grand Order.

Identity
Caster's True Name is Magical Girl Testament (魔法少女テスタメント), a being born from the wishes of Blackbeard, Phantom, Gilles de Rais, and Diarmuid after the First Lady is defeated.