Caster (キャスター), Magus and Heroic Spirit of Spells and Sorcery, is one of the Four Cavalry classes among the seven standard Servant classes summoned for the Holy Grail War. Servants placed within this class are usually adept in magecraft, and the only qualifying condition is the mastery of sorceries of the highest caliber compared to the specific parameter requirements of the other classes. Due to not requiring any strong statistics, they generally have low combat abilities, and due to the majority of Servants having some form of Magic Resistance, this class is thought to be the weakest of all seven. They make up for this with other means, using magecraft that no longer exists in the current age and, no matter which Heroic Spirit is of the class, possessing many possible ploys to be used against enemies. Those of the Saber class can likely challenge any Caster who uses magecraft as their main offensive ability without needing to plan due to their high Magic Resistance, while those of lesser resistance like the Rider class may require more strategy. Their class abilities are Territory Creation, altering the surrounding lands in favor of their sorcery, and Item Construction, which allows the magus to create magical items and tools.