"Among Heroic Spirits, there are ones who are legendary, ones who actually existed, as well as ones who were not actually observed nor recorded. Those who are seldom worshiped fall into the broad category of 'Guardians'. They are used as a "Counter Force" without a will.英霊には、伝説上のもの、実在したもの、観測され なかったものがおり、信仰が薄いものは“守護者”という大きな分類に含まれ、意思のない“抑止 力"として行 使される。本編に登場する英霊の中で“守護者"として機能している者はアーチャーのみ。 他の英霊たちは神性が高かったり、人間側ではなく星よりの存在になっている為、守護者に取り込まれずに済ん でいる。
Among the Heroic Spirits debuted in this story, only Archer had the role of 'Guardian'.
Due to having high Divinity, other Heroic Spirits are not on humans' side. Rather, they are on the side of the Planet. However, Guardians are not included in this particular category."
For some context about the "different types" of true Heroic Spirits.