Rancor is Dorn Il-Khan's starting weapon when he joins the party. It is an enchanted +1 two-handed sword. Additionally, when Dorn slays an enemy with it, a special -1 THAC0 is applied to the sword for 24 in-game hours. This item appears in Baldur's Gate: Enhanced Edition and Baldur's Gate II: Enhanced Edition
While characters other than Dorn can use it, they can only do so if they are Evil Aligned. If Dorn is wearing the Helm Of Opposite Alignment, even he can't use it until it is removed.
|“||This ebony two-handed sword is covered with inscriptions that you cannot decipher. It hums softly in the presence of Dorn Il-Khan. Individuals who are good of heart are overcome with feelings of guilt and anxiety when they hold this blade.||”|