Arondight

Arondight is regarded among the top three of Dragonsbane weapons. As the only item created from what legends refer to as True Metal, a metal said to be a splinter of Bahamut's physical being, its durability is unparallelled and Bahamut’s divine properties are said to permeate the blade. Unanimously, Arondight is only considered a Dragonsbane weapon because its existence couldn’t have been possible without the death of Bahamut on the physical plane.
The sword has been lost to the eons, and no one knows if it even ever existed, though more devout churches of Bahamut have throughout history attempted to present counterfeits to the masses as the real thing.