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Gain 20% of Physical Damage as Extra Chaos Damage against
Poison you inflict with Critical Strikes deals 30% more Damage
Recover 0.5% of your maximum Life per Poison affecting Enemies you Kill 
Toxic Delivery is a notable Ascendancy passive skill for the Assassin. It grants damage reduction for damage over time, more poison damage to poison that was applied with a critical strike, extra physical-to-chaos damage against poisoned enemies, and life recovery when killing a poisoned enemy based on amount of poison on it.