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Excalibur, one of the legendary swords within the «Destiny's Fate». The lore about it inside the game was almost no different from the legends that Shin had read in the real world. The only difference that they had was the historical note about this particular artifact. The game developers fitted its description in the main lore of the game.
This legendary artifact was the holy sword that the leader of the legendary knights of the round table, King Arthur Pendragon, had used in the past.
During the Repelling Era, one of the forces that led the human race to their victory was the Knights of the Round Table. And with King Arthur's lead, the knights killed countless demons during the war against the invading races from Hell.
But after a particular incident within their group, a rift was formed between the best knights of the round table and made them walk their own path after the war against the Demonic Races.