This is a fate spin off in this world the servants live free among the mages and they often form bonds and become teams the mage feeds the servant with mana and the servants serve both in combat if needed and in day to day dealings

Servant classes
Saber-master swordsman and swordswoman
Rider-masters of mounted combat
Lancer- masters of the spire
Assassin- masters of the kill
Berserker- pure power
Archer-masters of long range combat