A victim bitten by a venomous snake must make a DC 15 Constitution check with each bite. On a failure, the victim takes 1 additional point of damage per round for 1d6 rounds and is also Weakened for a similar duration expressed in hours. A new bite does not increase the damage per round but adds to the duration (maximum of 3 venomous bites per snake).

Some snakes spit their venom into an opponent's eyes to blind them. The victim must succeed on a DC 12 Dexterity check or be Blinded for 1d6 rounds.