The Supervisor (監督役, Kantokuyaku?) is a formal position taken in many Holy Grail Wars to help smoothly watch over the ritual.

Church supervisorEdit

Members of the church are tasked with watching over the Fuyuki Holy Grail Wars. After the Third Holy Grail War, the Mage's Association agreed to let the church supervise due to the artifact being fought over being called the Holy Grail.

Ruler-class ServantEdit

If a Ruler-class Servant is summoned by a Grail, they will be sanctioned to watch over the Holy Grail War.


SE.RA.PH watches over the Moon Holy Grail War and appoints AIs and NPCs as necessary. It will also delete those who break the rules, but it is possible for some Servants to fool it or avoid detection. Kirei Kotomine is designated as a Supervisor who deals with Masters. Archimedes is tasked by SE.RA.PH to take charge of its security. Within the Sakura Labyrinth, BB takes on the self-appointed role of "Gamemaster" and has almost complete control of the area.

Rule MasterEdit

The Rule Master of the Ainsworth Holy Grail War is the only individual with the authority to create and destroy Class Cards.


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