Ability List

A+: Servant can remain in this world indefinitely even without a Master. However, in order to activate his Noble Phantasm, it is necessary to first acquire an extra supply of prana from alternative sources.
A: Can remain in this world for a week even after losing his Master. However, to use Noble Phantasms of great prana consumption, back up from the Master is necessary.
B: Capable of remaining in this world for two days without an established contract. Also capable of living on for a short period of time after suffering extensive damage on his spiritual core.
C: Capable of remaining in this world for one day without an established contract.
E-: Materialization is possible for 30 turns.

EX: Rank-Up parameters, but robs most of reason. (Even while under Mad Enhancement, Spartacus can normally speak things such as "Those who are bound are strong! For until the time when they are set free, anger and sadness will continue to be accumulated." However, because he is fixated with thoughts of "always making the most difficult choices", he never listens to what people have to say. In practice, it is impossible to come to a mutual understanding of intentions with him. Spartacus is indeed an uncontrollable Berserker.)
A: Rank up for parameters, but most of one's reason is robbed. Due to undergoing consciousness equalization with the Master, one has become a more mechanical Servant.
B: Rank up for all parameters, but takes away most of sanity.
C: Rank up for all parameters except Luck and Mana, but in exchange one can no longer think and speak properly. (In Arcueid's case, it does not go well due a misunderstanding from the Master. Her original Rank in this Skill is A)
D: Strength and Endurance parameters are up. Frankenstein's language abilities are simple, and continuing complex thoughts over long periods of time is difficult.
E: Kintoki, while not strictly speaking mad, possesses the mentality of a grade schooler and intermittently flies into uncontrollable rampages. It is unclear if this is an effect of Mad Enhancement or his natural disposition.
E-: Elizabeth Bathory obtains this skill in the Berserker class, but as her consciousness is retained, rather than rendering enhancements to strength and endurance, merely 'the sensation of pain' is eliminated.

EX: In addition to the Magic Resistance of the Saber Class, Joan demonstrates high Magic Resistance due to her unwavering piety. However, since it is just averting (evading) the Magecraft, only Joan will be saved against a wide-range magic attack. It cannot cope with the sacraments of the Church either.
A: Cancel spells of A-Rank or below. In practice, the Servant is untouchable to modern magi, so it would not be an exaggeration to title the Servant a "Magus Killer".
A: In the case of Elizabeth Bathory, this ability exists as a hidden skill that the Servant herself isn't really aware of -- active due to the actual presence of draconian blood in her ancestry, rather than as a phenomenon generated by Innocent Monster. Renders a Magic Resistance comparable to that of the Saber of Fate/Stay Night.
B: Cancel spells with a chant below three verses. Even if targeted by High-Thaumaturgy and Greater Rituals, it is difficult for him to be affected. (As Saber Alter, Arturia suffered a rank-down in this skill due her corruption)
C: Cancel spells with a chant below two verses. Cannot defend against Magecraft on the level of High-Thaumaturgy and Greater Rituals. (Because she herself does not have any Magic Resistance, Nero boasts a low level that is unbecoming of the Saber Class)
D: Cancel Single-Action spells. Magic Resistance of the same degree of an amulet that rejects magical energy.
E: Cannot cancel spells, but magic damage is reduced somewhat. (Lancelot's originates from a magical ring, however its powers received a rank-down due to Mad Enhancement)

A+: It is possible to disappear completely and become almost impossible to be detected. However, efficiency will decrease once preparations to attack are taken.
C: Hides one's presence as a Servant. Suitable for spying. The rank of presence concealment drops considerably when preparing to attack. However, this condition does not apply to poisoning something.
D: Suitable for spying.
-: Li Shuwen's capacity to cut off his presence does not correspond to this technique. For the analogous ability that he possesses, please refer to Sphere Boundary.

EX: Violet Can ride anything. Rather, just assimilates it.
A+: Creatures on the level of Phantasmal Beast and Divine Beast can be used as mounts. However, that does not apply to members of the Dragon Kind.
A: All creatures but those of Phantasmal Beast and Divine Beast-rank can be used as mounts. This rank is high enough to have aptitude for the Rider Class.
B: Most vehicles can be handled with above average skill. However, cannot ride the likes of Phantasm Races such as Monstrous Beasts.