Pernicious Poison

Necromancy [poison]
Level: Antipaladin* 2, Artificer * 2, Druid * 2, Hunter * 2, Sorcerer */Wizard * 2, Warlock * 2
Components: V, S, DF
Casting Time: 1 Standard Action
Range: touch
Target: creature touched
Duration: 10 minute/level
Saving Throw: None
Spell Resistance: yes
  You weaken the target's defenses against poison. The target gains a -4 penalty on saves against poison, and poisons affecting the target continue for another 2 frequency increments (for example, black adder venom lasts 8 rounds instead of 6, and arsenic lasts for 6 minutes instead of 4). Attempts to cure the poisoned target with skill or magic take a -4 penalty.