The Bone Viper is an animated, undead snake skeleton, usually animated as a defender of some wizard’s tower or evil temple. It is able to spit its magically potent poison up to 5 feet, and anyone hit by its spit attack must make a save vs. Poison or become blinded. However, its poison is far more dangerous when injected by a bite; anyone bitten must save vs. Poison or die within 1d3 rounds.