Inaccurate?

Increase Virulence

(Player's Handbook II)

Transmutation
Level: Assassin 2, Bard 2, Blackguard 2, Sorcerer 2, Wizard 2,
Components: V, S, M,
Casting Time: 1 minute
Range: Touch
Target: Vial of poison or creature touched
Duration: 1 minute/level
Saving Throw: None
Spell Resistance: No

Ribbons of green and black energy engulf your hand and pass into the vial or creature you touch.
You make the poison in a vial or a creature more lethal.
The DCs for all saving throws against the poison increase by 2.
Material Component: Licorice root.