Kondar

Kondar is an enchanted bastard sword in the Baldur's Gate and Baldur's Gate II computer games. It is named after its original owner and is more powerful when used against shapeshifters (including doppelgangers), as well as growing warm in their presence. It is carried by Aldeth Sashenstar in the first Baldur's Gate game, and can be acquired from him by killing him in Cloakwood where he is first encountered, or by helping him there and later also helping him root out the doppelgangers infesting the Seven Suns, whereupon he will give it as a reward. Its property of growing warm in the presence of its prey is not implemented in the game in any way.

The same item also appears in Baldur's Gate II: Shadows of Amn, becoming something of a generic rather than specific item even though it has the same description.