Rod of Viper
This rod is a long and thin scepter, made of a pale, yellow-green stone. Its surface is smooth and glossy and the tip is shaped like a viper’s head. Two small emerald eyes glint from the head of the rod, and the mouth is open, revealing two curved fangs.
This material is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.
The Rod of Viper strikes as a +2 heavy mace. Once per day, upon command, the head of the rod becomes that of an actual serpent for 10 minutes. During this period, any successful strike with the rod deals its usual damage and also poisons the creature hit. The poison deals 1d10 points of Constitution damage immediately (Fortitude DC 14 negates) and another 1d10 points of Constitution damage 1 minute later (Fortitude DC 14 negates). The rod only functions if its possessor is evil.
Moderate necromancy; CL 10th; Craft Rod, Craft Magic Arms and Armour, poison, creator must be evil; Price 19,000 gp.