|Master of Caster|
|Appears in:||Fate/Prototype: Fragments of Blue and Silver|
|Character type:||Human, Master|
|Master rank:||3rd Rank – Thrones|
The unnamed Master of Caster is the Master of Caster in the First Holy Grail War of Fate/Prototype: Fragments of Blue and Silver. He is the current head of the Reiroukan family (玲瓏館の当主, ?) and Misaya Reiroukan's father.
Fate/Prototype: Fragments of Blue and SilverEdit
The Master of Caster is betrayed by Caster during the course of the war and killed.
The Master of Caster utilizes Rune Magic, Necromancy, and General Black Magic.