The Sword of Balduran is a bastard sword which is very effective against lycanthropes because it's made of gold. Because gold is a soft, heavy metal, it's not very effective when fighting other creatures. This item appears in Baldur's Gate: Tales of the Sword Coast.
There is another sword which once belonged to Balduran, though it is a completely different weapon, which appears in Baldur's Gate II. For more information on that weapon, see Sword of Balduran (long sword).
|“||This ornate, but poorly balanced, weapon was found within the wreck of Balduran's ship. Gold weapons are not known to be useful in combat, but legends say that only weapons forged of gold can harm such dread creatures as the loup garou.||”|
Enhanced Edition: icon & image