To make this as simple as possible: seven Masters like myself summon seven Servants--heroes from our world's past--to fight for a wish-granting artifact called the Holy Grail. Seven mythical heroes answer to arrogant mages with their heads firmly placed nowhere fit for polite conversation, and they all try to murder each other just to have some wish granted through a miracle.

And that's only the basic concept on paper. It gets far, far more idiotic and cruel, I can promise you that.

[Waver held up his right hand, showing Zelda the bright red sigil branded there.] For one thing, Servants can't exist without being connected to a Master, and these fucking awful things are proof of that contract. These Command Spells represent three absolute orders a master can give, and their Servant will be forced to follow them no matter what they might be.