In my au, Holy Grail Wars are used as a summoning events for Masters to summon Heroic Spirits to fight against the sentient Holy Grail. The first 3 wars were successful, but during the events of which Fate/Zero takes place, the 7 Masters have grown selfish and want to use the grail for their own reasons and are fighting each other instead of being allies. Chaldea, which was already established in the 1980s and was nothing more than a research center to study the Grail grew aware of this. To try to prevent the fighting, Marisbury Animusphere entered the war with a Caster class servant, King Solomon. Solomon does not fight, he’s used to prevent the bloodshed amongst each Master/Servant. This is how Solomon’s presence is first established in my AU’s lore timeline.
