The 8th class in the Servant System. The beasts.
Evils of Humanity. A term for those who aim for human extinction.
The seven Heroic Spirits from the original Servant System are summoned to defeat those Beasts. They’re humanity’s Counter Guardians, and the intended function of the system is for all seven to purge the Evil of Humanity, not for them to fight to the dead in a battle royale.
(Under these terms, Gaia’s Counter Guardians can also count as Beasts.)
Since being above mankind’s league is a prerequisite, they’re crazy powerful by default.
Beasts come in three types:
A: Those who doom humanity out of hatred/disavowal (Twice, Konjiki Hakumen).
B: Those who doom humanity out of affection/endorsement (Kiara, Mother Harlot).
C: Those whose regular activities indirectly lead to human extinction. Includes emissaries from outer space. (The Angra Mainyu born from Holy Grail, ORT)
If we eventually run multiple campaigns, we’ll alternate between all the Beast types.