The famous demonbane sword
Forged in the 3rd century DR, this weapon was forged by a master smith named Dornavver who saw the proliferation of evil artifacts and decided to do his part to fight back.
According to legend, this sword glows in the presence of demons and devils and is especially dangerous to them, drawing their fear and ire in battle. Some say it is a holy relic when used to banish evil back to their plane of origin.
After a storied stint with holy paladins and the Royal Guard of Impitur, the sword disappeared and is rumored to be somewhere on the Sword Coast.