Toxicologist

Infiltrator
Level 10: Coat your melee weapons in poison, adding a chance to apply stacking poison damage each round. +1d6/round poison damage for 1d3 rounds. Stacks up to 3 times. Fortitude save negates application of poison. DC = 10+Level
Level 15: DC increases to 20+Level
Level 20: Weapon Poison now stacks to 5 times