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Thorns
If you have Thorns damage, you inherently Retaliate against Melee Attack Hits, dealing your Thorns damage to the enemy that Hit you.
Some skills and other effects may also deal your thorns damage to enemies at other times.
Thorns is a stat that deals damage to enemies that hit you with a melee attack. It is similar to, but not considered to be Reflected damage. Mechanically, this works as if enemies are "hitting" themselves and triggers "all damage" effects back at them. Thorns damage is not attack damage or spell damage and is not affected by modifiers specific to those.
Mechanics
Thorns can trigger off from any melee hit, including blocked hits and hits that deal no damage, but not evaded hits. Thorns damage does not scale with the amount of damage the hit that triggered it dealt.
Thorns damage does not count as a character's own hit, and any effects inflicted by thorns damage (such as ailments) also do not count as originating from the player.
Thorns damage can be scaled by all relevant modifiers to damage, such as generic damage, physical damage (or other damage types for non-Physical thorns/with conversion), and critical hit chance/critical damage bonus. Thorns has a base critical hit chance of 0%, but can be increased through sources of base crit such as 
Briarpatch and Thornhide. Resolute Technique also removes thorns crit chance. Thorns damage can also be converted, including regular conversion (Avatar of Fire) and gain conversion.
Thorns can inflict ailments to enemies based on their chance to inflict ailments on all hits (for example an enemy with all damage shocks will shock themselves when they hit you). Thorns can inflict elemental ailments based on the damage it deals (such as if your thorns do fire damage from Avatar of Fire. Thorns do not benefit from players' increased chance to inflict ailments, but it does benefit from effects that apply to all hits, such as Shaper of Winter.
Crown of the Pale King allows thorns to trigger from non-melee hits. It also enables self-damage to trigger thorns damage against the player character.
Sources
Thorns can roll as explicit prefixes on belts, body armours, and shields. The largest provider of thorns damage is from Scavenged Plating.
Unique items
| Item | Base item |  | Stats |
|---|---|---|---|
Crown of Thorns | Twig Circlet | 1 | +(100-150) to maximum Energy Shield Lose 5 Life when you use a Skill (3-5) to (6-10) Physical Thorns damage Pain Attunement |
The Blood Thorn | Wrapped Quarterstaff | 1 | Adds (8-12) to (16-18) Physical Damage +(10-15) to Strength Causes Bleeding on Hit (4-5) to (8-10) Physical Thorns damage |
Briarpatch | Laced Boots | 11 | (10–20)% increased Movement Speed +(40–60) to maximum Life +(60–80) to Stun Threshold +25% to Thorns Critical Hit Chance (10-15) to (20-25) Physical Thorns damage |
Edyrn's Tusks | Iron Cuirass | 11 | (120-160)% increased Armour 50% chance to inflict Bleeding on Hit 50% reduced Slowing Potency of Debuffs on You (15-20) to (25-30) Physical Thorns damage |
Crown of the Pale King | Cultist Crown | 16 | (50–100)% increased Armour and Energy Shield +(40–80) to maximum Life 10% increased Rarity of Items found (10-15) to (20-25) Physical Thorns damage Thorns damage is triggered by all Hits |
Cloak of Flame | Silk Robe | 22 | +(30-50)% of Fire Resistance (30-50)% reduced Ignite Duration on You 40% of Physical Damage taken as Fire Damage 25 to 35 Fire Thorns damage |
Dreadfist | Bolstered Mitts | 27 | (60-100)% increased Armour (20-30)% increased Critical Damage Bonus Critical Hits inflict Impale Critical Hits cannot Extract Impale (20-31) to (31-49) Physical Thorns damage |
Belly of the Beast | Explorer Armour | 33 | (100-150)% increased Armour and Evasion +(100-150) to maximum Life +(100-150) to Stun Threshold Life Recovery from Flasks is instant (25-30) to (35-40) Physical Thorns Damage |
Prized Pain | Iron Ring | 48 | Adds 1 to 4 Physical Damage to Attacks+(20–30) to Strength Skills gain a Base Life Cost equal to 10% of Base Mana Cost Deal your Thorns Damage to Enemies you Stun with Melee Attacks (24–35) to (35–53) Physical Thorns damage |
Beetlebite | Velour Shoes | 52 | (20–30)% increased Movement Speed (60–120)% increased Evasion and Energy Shield Aggravate Bleeding on Enemies when they Enter your Presence 100% increased Thorns damage |
