There are many warriors who use deadly toxins to overcome their foes, turning an otherwise minor injury into a mortal wound.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A model with the Poisoned Attacks special rule gets a +1 modifier to its To Wound rolls. For example, if they would normally need to roll a 4+ To Wound, a model with Poisoned Attacks only need to roll a 3+ To Wound. Armour saves are modified by the Strength of the attack as normal.
Unless otherwise stated, a model with this special rule has both Poisoned shooting and close combat attacks (though any spells cast by the model or special attacks are unaffected).