The poisoning damage inflicted upon a foe when he is hit by a Lashsword is considerably weaker than that done by Apothecaries or Painboys. I remember backstabbing players with one heavy attack and even one fast attack afterwards, the same combo in front of them, face-to-face - even light-armoured opponents dont die out of poison although they definitely must. Remember that even one fast attack from a Painboy or an Apothecary in front of you, not talking about backstabbing, is enough to take almost 95% of your health - one heavy attack makes you dead from poisoning very quickly. I'm sure poisoning damage of a Lashsword should at least be equal to that of Apothecaries or Painboys in terms of HP (health points) taken per second. I also think this is fair because none of the eldar have access to high-tier weapons in melee (axes and claws) and hence we are by default weaker in melee - while, for example, orks became incredibly tough in melee (with these electrified choppas and burning choppas which can kill you from just one heavy attack, combined with shields this is a deadly combination) and CSM's weapons (Abaddon's grace first comes to mind) are devastating, even our melee specialist classes (banshees and scorpions) cant compete on equal terms.