Summon-a-Servant Mk 5: Five Servants per Second (Fate/Stay Night crossovers), Page 39

I would simply throw in the "unlike most other Skills, it is at A Rank that one is at a level where he is said to have finally "learned it" addendum so it follows the same martial arts ranking system.

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Summon-a-Servant Mk 5: Five Servants per Second (Fate/Stay Night crossovers), Page 39

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