Poison
Poison is a status ailment that deals chaos damage over time.
Poison status, defined as a modifier of 'hit poisons enemy', deals 10% of all damage (including physical, elemental, and chaos damage[1]) of the hit that caused it, as chaos damage per second. The effect lasts for 2 seconds, dealing 20% of initial hit damage in total.
It can be caused by:
- Critical strikes with daggers when the Adder's Touch passive skill is taken.
- Attacks with weapons that have the Poisonous Hit mod.[2] Currently,
Mortem MorsuMortem Morsu
Fright ClawClaw
Physical Damage: (21-24) to (80.5-92)
Critical Strike Chance: 7.88%
Attacks per Second: 1.80
Weapon Range: 1.1 metresRequires Level 34, 61 Dex, 61 IntGrants 20 Life per Enemy Hit(75-100)% increased Physical Damage
20% increased Attack Speed
25% increased Critical Strike Chance
+40% to Global Critical Strike Multiplier
(10-20)% of Physical Damage Converted to Chaos Damage
25% reduced Enemy Stun Threshold with this Weapon
60% chance to Poison on HitFear blisters the heart and thins the blood.
Fear squeezes lungs and sets the guts to fester.
Fear is the wound left untended.
and 
SnakebiteSnakebite
Assassin's MittsEvasion: (260-344)
Energy Shield: (21-25)Requires Level 58, 45 Dex, 45 Int(150-180)% increased Evasion Rating
+(60-70) to maximum Life
2% increased Attack Speed per Frenzy Charge
6% increased Accuracy Rating per Frenzy Charge
10% reduced Frenzy Charge Duration per Frenzy Charge
Attacks have 60% chance to Poison while at maximum Frenzy Charges
+5% to Damage over Time Multiplier for Poison per Frenzy Charge"As the serpent shuns thought,
It shuns fear.
It strikes with the speed of wrath
And the skill of compulsion."
- Deshret, The Red Sekhema
are the only items with this unique mod. - Monsters with the "Vile Touch" Nemesis modifier.
- The Module Error: No skills found with q_where = skill.active_skill_name="Poison Arrow" skill. However, the poison status inflicted by it is an exception to the normal poison effect, and has its magnitude and duration defined by the skill gem. It's still considered to be the same effect so it cannot stack with aforementioned 'poison'.
Notes
Separate applications of poison do not stack cumulatively. Each poison effect remains present on the target until it runs its course, but only the one with the highest damage per second will cause damage at any given moment.[3] For example, assuming an enemy is inflicted with poison for 100 damage per second, then after 1 second it is inflicted with poison for 50 damage per second. The outcome will be 200 damage over 2 seconds followed by 50 damage over 1 second.
Charges from the 
Viper Strike skill are not considered to be poison, so they will stack with it.[4]
The damage of the poison effect, like any other damage over time effect, can be increased by the Module Error: Too many skills found with q_where = skill.active_skill_name="Vulnerability". Please choose only one of the following ids:
IzaroVulnerabilityPylonOnDeath - 40% increased Physical Damage taken, 20% chance to be inflicted with Bleeding when Hit by an Attack, Base duration is 10.00 seconds (page)
IzaroVulnerability - Base duration is (5.00-6.45) seconds, Cursed enemies take (15-25)% increased Physical Damage, Attacks Hits against Cursed Enemies have 25% chance to inflict Bleeding (page) curse.
References
- ↑ Mark_GGG (May 14, 2012). "Adder's Touch". Official Path of Exile Forums. Retrieved July 7, 2013.
- ↑ Mark_GGG (November 1, 2012). "Unique Items List - 163 of 163". Official Path of Exile Forums. Retrieved July 7, 2013.
- ↑ Mark_GGG (July 7, 2013). "Adder's Touch". Official Path of Exile Forums. Retrieved July 7, 2013.
- ↑ Mark_GGG (July 8, 2013). "Adder's Touch". Official Path of Exile Forums. Retrieved July 9, 2013.