It is one of the ultimate god-forged weapons, a Last Phantasm, which was guarded by extensions of the planet, Fairies, before briefly being passed on to Arturia by the Lady of the Lake and later returned to the lake before her death. It replaced the destroyed Caliburn, and its sheath, Avalon, provided partial immortality for its wielder. She eventually lost Avalon, and replaced it with Invisible Air, which she uses during the Holy Grail Wars to hide the sword and her identity. While it takes time to figure out the Noble Phantasms and identities of other Servants, Lancer is able to deduce her as King Arthur from only a glance at the sword, claiming that any Heroic Spirit that has traversed time and space to join the Holy Grail War will never mistake her golden sword for any other. It is a t