|Character type:||Servant (Master: None)|
Ruler (ルーラー, Rūrā?) is a non-standard Servant class brought forth for the purpose of presiding over Holy Grail Wars. The Fuyuki Grail utilizes its own logic to sense when actions are encroaching upon its authority, and regardless of other mediators like those from the Church, it brings forth Ruler to protect the concept of the Holy Grail War itself. In the case of the reserve system of the Greater Grail being activated in the Great Holy Grail War, Ruler takes neither side of the battle, but only acts in the interest of the Grail. The Ruler-class Servants are given Command Spells for the other Servants.
The criteria to be summoned for the Ruler-class is impartiality and possessing no desire for the Holy Grail. Those who qualify are most often Saints, and any Ruler summoned to preside over a Holy Grail will be a saint under normal conditions. Within other systems like the FATE system, others who meet the criteria can be summoned. One exception to the normal rule of impartiality is Amakusa Shirou Tokisada, an aberration who does not normally qualify, summoned by the Einzberns as the Heroic Spirit who was considered the closest to a ‘Saint’ that could possibly be found in the Far East.
|Amakusa Shirou Tokisada‡||Third Holy Grail War||Einzbern Master|
|Joan of Arc‡||Great Holy Grail War||None|
|Joan of Arc (Alter)||Grand Order||None|
|Sherlock Holmes||Grand Order||Protagonist|
Servants possessing the class of Ruler for special reasons unrelated to a proper summoning.
|Saint Martha (Swimsuit)||Grand Order||None|
Other qualifying heroesEdit
|Heroic Spirit||Current class||Notes|
|Robert E. Lee||None|