The Baneful
Rare
Shortsword · Martial Weapon
1d6 Piercing
Weapon Enchantment +1
Favoured Weapon: This weapon has a +1 bonus to damage and attack rolls.
Baneful Bond: On a hit, possibly
Bane your target.
The wizard Otiluke wrote about bound weapons and their propensity to coalesce with their wielder as the pair come together. He also wrote about their dangers, which are manifold, and their benefits, which make the danger worth it.
How to obtain
Act 1 Found in the world Underdark