Ink Toxin
Number of Doses: 1 (3 parts)
Type: Contact
Onset: 1d4 rounds
Damage/Result: -1d4 int, -2d4 con if fail, save DC 28 negates
Frequency of Active Ingredient: Common
Cost per Dose: 700 gp
Crafted from the ink sack of a rare magical creature, this poison appears to be normal black transcribing ink with a faint green hue. Commonly used by clever assassins, a letter will be written to the target using this ink where deadly results will follow.
Sounds like a plan!