The weapon can inflict 1d6 +3 points of damage, has -3 THAC0 bonus and weighs 5 lbs. Despite the fact the statistics claim this weapon has speed factor of 6 in Baldur's Gate II, it's actually 3 in the game files. This item appears in Baldur's Gate, Baldur's Gate: Enhanced Edition, Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition.
In Baldur's Gate II, this weapon can be found in the Underdark near the object that house the victims of the spell Imprisonment.
In Baldur's Gate: Enhanced Edition the weapon is wielded by Osmadi in Larswood.
|“||This cursed spear will appear as a magical spear, however when a combat situation arises, the wielder will attack an enemy and Backbiter will attack the wielder. For every attack made, Backbiter will attack the foe and also the wielder. This is a powerful spear, but one must ask if it is worth it in the end. The only way that Backbiter can be removed is by a remove curse spell.||”|