A long time ago, an ordinary sword was soaked with blood through the endless battles of its era, causing the sword to be corrupted and becoming sentient by its own, which earned it the name "Soul Edge". No one dared to wield the sword without getting corrupted by its evil spirit, and only the Hero King, Algol can wield it without getting possessed. However, Algol's son, jealous of his father's feat, wielded the sword and became corrupted. Algol destroyed both his son and the sword, from which he then made a weapon in grief, naming it "Soul Calibur". He was sacrificed to complete the sword's ritual which would then be protected by a cult; no one knew that Soul Edge would reform on its own later on. Soul Calibur itself was lost after it was stolen by a member of the cult, Zasalamel.
Below are the characters on the site that cosplayers have depicted.