Parameter Rules

Parameter rules (パラメータールール) are letter rankings to show the relative power of each ranked item under different systems, translated into specific parameters "for no particular reason." There are five main ranks, E, D, C, B, A, that each have a quantifiable number assigned to it. Considering "one" to be a "normal value", E is equal to "ten" and it increases by ten incrementally until reaching "fifty" at A. There is also an EX rank that represents a value that cannot be quantified under the normal system because it is in a league of its own, powerful to the extent of rendering comparisons meaningless. There are two different "modifiers" that can be applied to ranks, + and -. The "+" modifier represents the capacity of a temporary boost in power if certain conditions are met, allowing a weapon or ability of a lower rank to surpass a higher rank for a moment. While a B+ is generally weaker than an A, B+ may momentarily exceed A by doubling its own power. + indicates a two-times increase, ++ indicates a three-times increase, and +++ indicates a four-times increase. The specifics of the "-" modifier has not been explained, but it is present in a number of different situations.

While the ranks correspond to numbers, there may be cases where the specific rank matters more than the number it represents. The Noble Phantasms God Hand and Armor of Fafnir defend directly on the basis of rank, even though the parameters for Noble Phantasms and regular attacks differ. Converting the numbers, Noble Phantasms of C rank are the equivalent of an A+ or A rank regular attack, but the armor Noble Phantasms only defend according to the rank of each individual system while ignoring the equivalence.


 * Physical attacks: Physical attacks of a powerful enough nature, like those of Servants, can be ranked as such. While a sword Noble Phantasm may be A-rank, the rank is not fulfilled without activating its true power as a Noble Phantasm, so the strength of a strike instead comes from the Servant's strength parameter.


 * Magecraft: The amount of power that goes into a spell decides its rank, mitigated by abilities like Magic Resistance. A rank magecraft is already on the level of High-Thaumaturgy, and Magecraft of A+ rank is said to be almost at the level of Magic.


 * Servant statistics and skills: Under the Servant system, their six parameters and main skills are each given a rank corresponding to their overall abilities. Due to various factors, they may be lower or higher than normal, and abilities like Mad Enhancement can increase them beyond even their optimal level. Heroic Spirits possessing A+ level attributes are rare, those possessing A++ attributes are extraordinary, those possessing A+++ attributes are in a class of their own, and those possessing EX attributes have truly exceptional abilities that fall outside of the numerical ranking scale. Gilgamesh, although he does not possess very impressive scores for his overall abilities, is clearly distinguished from other Heroic Spirits due to his EX Noble Phantasm parameter. Abilities will often base the effectiveness of the attack or effect directly on rank, and there are those that have "Strength checks" or "Luck checks."


 * Noble Phantasms: Noble Phantasms are on a higher scale than regular attacks, with a Noble Phantasm of C rank being the equivalent of an A+ or A rank regular attack. A++ and EX rank Noble Phantasms are said to be a mystery on the level of Divine Spirits. In the case of armaments being used as physical weapons without being activated as true Noble Phantasms, their attacks are based only upon the strength of their wielder. There are Noble Phantasms that can be quantified directly by numbers when referring to their abilities, but there are also those with conceptual effects that fall into a special category.


 * Servants and Masters: Servants and Masters are granted some form of rank through unknown parameters. Heroes of the highest fame are said to almost always be A rank Servants. Hakuno Kishinami is an E- rank Master, while Rin is considered A rank. Lancer is estimated to rank from B+ to A as a Servant, while Gilgamesh ranks at EX. If a normal A-rank Servant is "100", Caster ranks at "9."


 * Magic Circuits and Regression to the Age of Gods: Magic Circuits and Regression to the Age of Gods are ranked by Quality (質) and Quantity (量). There is also an accompanying Composition (編成) measurement that describes their overall ability instead of a letter rank.


 * Humanity Foundation Value: Humanity Foundation Value is an unknown system relating to the Holy Grails of Fate/Grand Order.