Атрум Ґалліаста

Atrum Galliasta is the first Master of Caster in the Fifth Holy Grail War of Fate/stay night.

Atrum's family being newly established in the Mage's Association caused him to seek out prestige by winning the Holy Grail War. Like Bazett Fraga McRemitz, he was one of the magi backed by the power of the Association.