The unnamed Master of Caster is the Master of Caster in the First Holy Grail War of Fate/Prototype: Fragments of Sky Silver. He is the current head of the Reiroukan family (玲瓏館の当主, ?) and Misaya Reiroukan's father.
In the Holy Grail War of 1991, he is the current family head of the Reiroukan family. His family includes his wife and only daughter, Misaya.
Being from one of the elite magus families in the east, Lord Reiroukan and his family maintain many connections with politicians, leaders and businessmen causing them to have a lot of pull with local governments.
Lord Reiroukan's appearance is not heavily mentioned or shown in the novels.
He is a very influential character, having ties to political figures. He loves his daughter Misaya and his family very much.
Fate/Prototype: Fragments of Sky 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.