The character is a master in the manipulation of poisons, exempt from the INT test when applying poison to their blades. They also know how to concoct a vial of poison, which requires a short rest phase, sacrificing their HP recovery.
Evolution
Level 1: The character knows how to concoct a vial of Slowing Poison.
Level 3: The character knows how to concoct a vial of Weakening Poison.
Level 5: The character knows how to concoct a vial of Paralyzing Poison.
Level 7: No tests are necessary to apply poison to weapons anymore, but it still counts as an action (M or A) during combat.