Not long after the Servants of the Black and Red Factions left the forest that had served as their battlefield, someone belonging to a third party stepped into the devastated area.
Jeanne d'Arc's brow furrowed slightly as she touched the enormous mass of igneous rock beneath her feet, so starkly out of place amid the surrounding soil.
The privileges granted by her Ruler Class allowed her to identify a Servant's Spirit Origin amplitude from the traces of their battles, and thereby determine their Class and some of their abilities.
The vast swaths of broken trees were the result of the fierce battle between Red Rider and Black Lancer. The tiny puncture marks in the trunks came from arrows fired by both sides' Archers, while the triangular patch of ground amid the lava was a product of the clash between Red Berserker's and Saber Alter's Noble Phantasms.
But...
The Spirit Origin amplitude emanating from the patch of igneous rock beneath her feet, roughly thirty meters square, matched none of the seven known Classes.
Violent, turbulent, unending.
A malice steeped in hatred-not all of it came from the Servant themselves. Some was inscribed upon their vessel, their Class.
Never fading, never wearing away.
Upon realizing this, Jeanne d'Arc suddenly recalled a piece of knowledge granted to her by the Holy Grail, one she had almost forgotten in some dusty corner of her mind-
Class: Avenger.
A Class that brought Heroic Spirits into the world with hatred and a desire for vengeance against someone or something as their driving force, endowed with the ability to grow stronger the longer they fought.
Like Ruler, it was an Extra Class outside the standard seven.
To think the Red Faction summoned a Servant like this... no.
*The Black and Red Factions must have equal numbers of