for DRG: The Gae Bolg is a (somewhat) replicated but still unique relic. Only one is crafted for every generation of the Azure Dragoon and it's usually crafted by blacksmiths in Ishgard. This though conflicts with the relic weapon questline lore of where (whats her name) Dragoon took up her fallen lovers spear and drove it into the heart of the Dragon who killed him.

Source: Forgot where I saw the first half of this. Correct me if I am wrong.