Ailments are a family of common Debuffs associated with specific damage types. The list of Ailments is: Bleeding, Ignite, Chill, Freeze, Shock, Electrocute, and Poison.

Bleeding is an Ailment that deals Physical damage over time, and lasts 5 seconds by default. Damage from Bleeding bypasses Energy Shield

Bleeding deals an extra 100% damage while the target is moving, or if the Bleeding is Aggravated.

Physical damage from Hits Contributes to Bleeding Magnitude.

Damage does not Contribute to Bleeding chance, so it cannot be inflicted without an explicit source of Bleeding chance.

The base Magnitude of Bleeding is Physical damage per second equal to 15% of the Pre-mitigation Physical damage of the Hit that inflicted it. This magnitude is not further affected by any modifiers to the damage you deal.

Modifiers and Debuffs that affect the enemy's ability to mitigate damage (such as Shock) can affect the damage the enemy takes from Bleeding, but any such modifiers that specifically apply to Hit damage (such as Armour Break) do not affect Bleeding damage.

Hinder is a Debuff that Slows movement speed by 30% unless otherwise specified. Unless Specified, Hinder has a duration of 4 seconds.

Ignite is an Ailment that deals Fire damage over time, and lasts for 4 seconds by default.

The chance for a Hit to Ignite a target is determined by the total Magnitude of Flammability on the target, including the amount added by that Hit.

Fire damage from Hits Contributes to the Magnitude of Ignite, so Hits dealing more Fire damage inflict stronger Ignites.
The base Magnitude of Ignite is Fire damage per second equal to 20% of the Fire damage dealt by the Hit that inflicted it. This is calculated using the final damage dealt by the Hit, but not any modifiers on the target that affect how much damage they will take from the Hit. This Magnitude is not further affected by any modifiers to the damage you deal.

Modifiers and Debuffs that affect the enemy's ability to mitigate damage (such as Shock) can affect the damage the enemy takes from Ignite, but any such modifiers that specifically apply to Hit damage (such as Penetration) do not affect Ignite damage.

Flammability is a Debuff that provides the chance for Hits to Ignite the target. It is not itself an Ailment, but is closely associated with Ignite, which is.

Fire damage from Hits Contributes to the Magnitude of Flammability, so Hits that deal more Fire damage will Ignite more often.

The base Magnitude of Flammability is 1% chance to Ignite the target for every 5% of the target's Ailment Threshold dealt as Fire damage. Flammability from a Hit is applied before that hit checks whether it should Ignite the target, and so will affect that chance for that Hit to Ignite.

Since chance for Hits to Ignite comes from Flammability on the target, modifiers which increase the chance to inflict Ailments will increase the Magnitude of Flammability inflicted.

Effects which do not Hit targets, but Ignite as if they had, such as Ignited Ground, also inflict Flammability, but do not roll a random chance to Ignite. Such effects will only Ignite once the total Flammability on the target reaches 50%.

Multiple instances of Flammability stack, raising the chance for Hits to Ignite the target up to 100%. Each instance of Flammability has its own independent duration, lasting 8 seconds by default.

Poison is an Ailment that deals Chaos damage over time, and lasts 2 seconds by default. Damage from Poison bypasses Energy Shield.

Physical and Chaos damage from Hits Contribute to Poison Magnitude.

Damage does not Contribute to Poison chance, so it cannot be inflicted without an explicit source of Poison chance.

The base Magnitude of Poison is Chaos damage per second equal to 20% of the Pre-mitigation Physical and Chaos damage of the Hit that inflicted it. This magnitude is not further affected by any modifiers to the damage you deal.

Modifiers and Debuffs that affect the enemy's ability to mitigate damage (such as Shock) can affect the damage the enemy takes from Poison, but any such modifiers that specifically apply to Hit damage (such as Penetration) do not affect Poison damage.

Debuffs you are Unaffected by can still be placed on you, but will not actually apply their effect.

Slows are modifiers from Debuffs that cause actions to take longer. Slows can apply to a specific stat (such as attack speed or movement speed) — if a specific type of slow is not specified, it applies to everything the affected entity does. Slows are always multiplicative with each other.

Higher Rarity enemies are less affected by Slows:

15% less Slow effect on Magic monsters
30% less Slow effect on Rare monsters
50% less Slow effect on Unique monsters

Additionally, Slows have 10% less effect on all monsters for each player in the area beyond the first and monsters cannot be slowed below 75% of their base speed.

Curses significantly Debuff affected targets. By default a target can have one Curse on them at a time.

Higher Rarity enemies are less affected by Curses:

15% less Curse effect on Magic monsters
30% less Curse effect on Rare monsters
50% less Curse effect on Unique monsters

Exposure is a type of Debuff that lowers the affected enemy's Total Elemental Resistances. By default it lowers Resistances by -20% and lasts for 4 seconds, though some sources of exposure can override these values. Like most sources of lowering Resistances, this can cause the enemy's Resistance to become negative.

Higher Rarity enemies are less affected by Exposure:

15% less Exposure effect on Magic monsters
30% less Exposure effect on Rare monsters
50% less Exposure effect on Unique monsters

Multiple effects on enemies can be Consumed. Only one Consumption benefit can occur at once, and Consumption effects from Skills will take priority over those from other sources.

Consuming a Debuff on an enemy causes the enemy to be immune to that Debuff for 1 seconds.

Auras apply Buffs to Allies within a radius, or Debuffs to enemies within a radius of the source of the Aura.

The Magnitudes of a Buff or Debuff are the values of the stats it applies to the target. A Buff or Debuff with higher magnitudes is more powerful.

Modifiers to the Magnitude of Buffs or Debuffs come from whoever applies it and are multiplicative with modifiers to the Effect the Buff or Debuff has on the target.

Modifiers to the Effect of Buffs or Debuffs usually come from the target it affects and are multiplicative with modifiers to the Magnitudes of the Buff or Debuff, which come from its creator.

Corrupted Blood is a Debuff that deals Physical damage over time and can stack up to 10 times.

Corrupted Blood is not Bleeding and is not affected by any stats related to Bleeding.

Bleeding that has been Aggravated always treats the target as moving, which causes it to deal 100% extra damage.

Once a Bleeding Debuff has been Aggravated, it will remain Aggravated until its duration expires.

Each Bleeding Debuff can be Aggravated, or not, independently — one Bleeding Debuff being Aggravated does not mean other Bleeding Debuffs on the target are also Aggravated, and Aggravating some or all of them will have no effect on new Bleeding Debuffs applied afterwards. However, effects which Aggravate Bleeding on a target do so to all Bleeding Debuffs currently on that target unless otherwise specified.

Ignite that has been Aggravated deals 100% extra damage.

Once an Ignite has been Aggravated, it will remain Aggravated until its duration expires.

Just like Bleeding, each Ignite Debuff can be Aggravated, or not, independently of others on the target.

Marks are a family of Debuffs that apply powerful effects to a single enemy, usually for a limited duration. You can have multiple Marked enemies at once, but each individual enemy can only have a single Mark applied to them at once.

Intimidate is a Debuff that inflicts 10% increased damage taken and 10% reduced damage dealt.

This Debuff causes you take 10% increased damage and have 10% reduced Light Radius for 10 seconds per stack.

Payoff Skills have powerful extra affects when Hitting enemies inflicted with specific Debuffs, often Consuming the Debuff in the process. Payoff Skills cannot inflict the Debuff they interact with.

Grasping Vines is a stacking Debuff that Slows character movement speed by 8% for each stack applied.
Moving will gradually remove stacks of Grasping Vines.

Petrify is a Debuff which causes targets to become covered in stone and unable to move or act.

Binding Chains is a stacking Debuff that Slows character movement speed by 8% for each stack applied.

This is modifier applies to Debuffs you inflict that Slow enemies, and scales only the specific Magnitude that slows the target. It will not affect any other Magnitudes that Debuff has if it does other things in addition to the Slow.

While Bleeding enemies build up Bloodstained, gaining the Bloodstained Debuff after Bleeding for a total of 6 seconds. Bloodstained builds up 100% faster if the Bleeding enemy is moving or the Bleed is Aggravated.

Certain skills allow you to view the Bloodstained Debuff on enemies and can consume the Debuff for powerful effects.

Impale is a Debuff inflicted by Hits, which stores 30% of the Pre-mitigation Physical Hit damage of the Impaling hit as its Magnitude.

Subsequent Attack Hits against Impaled targets will Extract the Impale debuff. When this occurs, the Magnitude of the Impale is added to the Pre-mitigation Physical damage of that attack hit.

A maximum of 60 Impale Debuffs can be present on a target at once. If multiple Impales are present on a target, each Attack's Hit only Extracts and benefits from the strongest one of them.

Easy Target is a Debuff which causes the next Projectile Attack Hit against the affected target to deal increased Damage, at which point the Debuff is consumed.

This effect will occur when a hit with the weapon directly causes at least one Bleeding Debuff on the target to become Aggravated.

It will not occur if an on-hit effect tries to Aggravate Bleeding but there are no Bleeding Debuffs on the target to Aggravate, or all of them are already Aggravated, since no Bleeding Debuffs will be Aggravated by that hit.

Players possessed by the Spirit Of The Ox have 50% reduced Slowing Potency of Debuffs on them, 60% increased Elemental Ailment Threshold and Armour and 20% reduced damage taken.
Players will also periodically summon a spiritual stampede of Oxen that tramples over enemies.

Monster has 50% reduced Slowing Potency of Debuffs on them.

Monster creates an Aura that Debuffs enemies within 4.2 metres, causing their Life and Energy Shield to not be able to recover past 50%.

Monster creates an Aura that Debuffs Enemies within 3.2 metres; Slowing by 25%, making effects expire 40% slower and reducing Cooldown Recovery Rate by 60%.

Targets affected by a Spectral Fire Debuff do not take damage from Ignite. Instead that damage feeds the Spectral Fire. When the Spectral Fire Debuff expires or the target dies, the Spectral Fire explodes, dealing all the damage it has absorbed to all enemies within 1.8m, including the affected target.

Debilitate is a Debuff that inflicts 20% reduced movement speed and 10% reduced damage dealt. Unless specified, Debilitate lasts 1 second.

Marked for Death is a Debuff that causes you to take 50% increased damage.

Riven Armour is a Debuff inflicted by Hits, which stores 5% of the Pre-mitigation Physical Hit damage of the Hit that inflicts it as its Magnitude.

The inflicter's subsequent Attack Hits against the target will gain additional unscaleable added Physical Damage equal to that magnitude.

Enemies with Riven Armour cannot get their Armour Broken further.

Broken Stance is a Debuff inflicted by Hits, which stores 5% of the Pre-mitigation Physical Hit damage of the Hit that inflicts it as its Magnitude.

The inflicter's subsequent Attack Hits against the target will gain additional unscaleable added Physical Damage equal to that magnitude.

Enemies with Broken Stance cannot be Dazed again.

Sundered Armour is a Debuff that can be applied to enemies with Fully Broken Armour that increases the Physical damage they take from Hits by an additional 20%. This effect stacks with the target's normal Fully Broken Armour.

Unless otherwise specified, modifiers to Fully Broken Armour also apply to Sundered Armour. Enemies with Sundered Armour cannot get their Armour Broken further.