Well, I know that most people who read this book have either played FSN, watched the anime, or read the novel. In any case, I should still make a declaration just in case someone new to the series decides to jump in??
Glossary of Terms
[Holy Grail]: An omnipotent wish-granting vessel, a magical artifact with the ability to [grant wishes].
[Holy Grail War]: A battle fought to claim the Holy Grail, a ritual where seven Masters summon seven Servants to compete for the final victor to claim the Holy Grail. It is held once every sixty years. After the Fifth Holy Grail War, the Greater Grail was dismantled, and the Holy Grail War should have officially ceased. However…
[The Three Families]: The three magus families who initially established the framework for the Holy Grail War. The Matou family provided the system for summoning Servants. The Tohsaka family provided the land and leylines for the Holy Grail War, and the Einzbern family was naturally responsible for providing the Holy Grail. Therefore, in the Holy Grail War, these three families were often the first to receive Command Spells, and they are known as The Three Families.
[Servant]: The condition for Heroic Spirits to manifest in the world. Heroic Spirits are beings who, during their lives, accumulated great deeds and fame, or possessed powers of a miraculous level. After death, they are elevated to the status of Heroic Spirits, existing outside the flow of time. Heroic Spirits cannot be commanded by humans; Servants, strictly speaking, are akin to [familiars]. The seven different archetypes of Servants can integrate the [souls] of seven Heroic Spirits, thereby allowing Heroic Spirits to descend into the present world. Even so, the magical energy required for a Servant's manifestation is still immense, and they can only be summoned by relying on the power of the Holy Grail.
[Class] refers to the Servant's profession, which are divided into seven classes: Saber, Lancer, Archer, Rider, Caster, Assassin, and Berserker. Each class has its own unique characteristics. [Magus]: Unlike the common understanding of card tricks or minor tricks used to deceive human eyes with props and techniques, this refers to humans who utilize [thaumaturgy]. To ordinary people, a Magus is essentially a sorcerer. However, the difference is that in the world of Magus, [magic] is a very strict concept, only describing great thaumaturgical miracles that humans cannot achieve.