Katana +3

Katana +3 is an enchanted weapon which inflicts 1d10 +3 points of slashing and it has -3 THAC0 bonus. The katana weighs 3 lbs and it has a speed factor of 1. This item appears in Baldur's Gate II: Throne of Bhaal and Baldur's Gate II: Enhanced Edition. The merchants Carras and Karthis al-Hezzar sell this, as does the Tankard Tree.

In-game description
"Katana +3 To enchant a katana is no simple process. Unlike conventional weapons, the katana is already a near-perfect fighting sword. To improve it usually requires a sacrifice, perhaps a dying samurai might beg a Wu Jen to infuse his fighting spirit into the spirit of the katana. The wielder of an enchanted katana, such as this one, must respect the customs of Kara-Tur and of the samurai who once carried this blade into battle. Not doing so could drastically change one's luck for the worse."