User blog comment:Merkarion/End of the Great War/@comment-31137559-20181025183305/@comment-37165251-20181026184542

True, but if I remember right the strongest are created by God (which would be Caliburn, Excalibur, Arondight, Durandal)

I think it was even said in the Light Novel. Which is why they couldn´t remade Excalibur in the beginning (it was in the end, but this was long after the War when they could use the knowledge of all three Factions, so after the Peace Treaty)