Kabal of the Poisoned Tongue: The Serpent's Kiss

Each time a model with this Obsession makes an attack with a poisoned weapon, improve the Poisoned Weapon ability of that weapon by 1 to a maximum of 2+ (e.g. Poisoned Weapon (4+) becomes Poisoned Weapon (3+)). If an enemy unit has any models destroyed by an attack made with a poisoned weapon by a model with this Obsession, until the end of the turn, subract 1 from Combat Attrition tests taken for that enemy unit.