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Of the Command Spells that are left after the Holy Grail War, they are amassed in the hands of the supervisor and commissioned for safekeeping. Masters aim to kill other Masters rather than simply cut off their combat effectiveness so that they will not be able to take up another contract in the future. The Church provides protection to Masters without Servants for the reason of them having greater chance of obtaining leftover Command Spells. While searching for new Masters, it will prioritize those who had been previously chosen. Lost Command Spells are reclaimed by the Grail during the Holy Grail War and can be redistributed to new contractors who take on a Servant who has lost their Master. When Kirei Kotomine regains new Command Spells when six established contracts still remain in the Fourth Holy Grail War and without him being of the Three Founding Families, it is an unprecedented feat explained only by the Grail itself having high expectations of him and the unconscious desire in his heart. They will not lose their Command Spells so long as there exist Servants without established contracts. With regular Masters, this happens instantly upon losing their Servant, and only members of the Three Founding Families have shown the ability to exercise the authority of a Master even without a Servant. Command Spells do not disappear simply with the loss of a Servant, but instead only when one gives up or loses their right to be a Master. Once all Command Spells have been given out, or even if fake substitute Command Spells are created in the case of Caster's contract with Assassin, new proper Command Spells will not be created with the addition of a new contract. Their loss does not indicate forfeiture of position in the Grail War, as the contract with the Servant is also part of being a Master. It is possible to steal more from other Masters or receive more from the overseer depending on circumstances, and it is also possible that anyone interfering with the activities of the Church will have their Command Spells decreased. Even if a Master contracts with multiple Servants at once, they will only be given a total of three Command Spells that can be used on any contracted Servant. They disappear as they are used up, and it can be said that a Master who uses up all three loses authority over their Servant. Depending on the nature of the Servant, such binding is not necessary, while others may slay their Master instantly should all three be lost.
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Masters obtain three Command Spells, and Servants have no choice but to cooperate with their Masters due to their hold over them. The Fuyuki Holy Grail grants a total of twenty-one Command Spells in each war.
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