Bolt of Biting

Bolts of Biting are bolts designed with a barbed tip coated in poison. The bolts does 1d8 physical damage, while the poison inflcits 30 points of damage within 15 seconds. These bolts are found commonly in Durlag's Tower and they are sold at Sorcerous Sundries.

In-game description
"The bolt of biting was designed as a deadly compliment to the crossbow. With the barbed tip coated in a nasty poison that will infiltrate the bloodstream of its victim causing agony and oft-times, death."