Physical damage is one of the five Damage Types. It is the most common and the only one reduced by Armour, rather than by a Resistance.

Most physical damage comes from Weapon Attacks, but some Spells and other skills deal physical damage as well. Physical damage over time can be inflicted with Bleeding.

Fire damage is one of the five Damage Types. It is reduced by Fire Resistance. Fire Hits inflict Flammability based on how much Fire damage is dealt, which provides a chance to Ignite.

Cold damage is one of the five Damage Types. It is reduced by Cold Resistance. Cold hits apply Chill and build up Freeze, but cannot build up Heavy Stun.

Lightning damage is one of the five Damage Types. It is reduced by Lightning Resistance. Lightning hits have a chance to Shock based on how much Lightning damage is dealt.

Chaos damage is one of the five Damage Types. It is reduced by Chaos Resistance.
Chaos damage is the least common damage type, and removes twice as much Energy Shield as the damage value when taken.

All Damage is taken from Mana before Life
50% less Mana Recovery Rate

By default, specific Ailments are calculated based on only specific damage types, such as only the Fire damage of a Hit mattering when inflicting Ignite.

Allowing another damage type to contribute to an Ailment means that all damage of the relevant types is summed when performing calculations for that Ailment.

For Ailments that use Hit damage to determine Ailment chance or buildup, this means that the damage type becomes capable of inflicting that Ailment. For Ailments that only use Hit damage to determine Ailment Magnitude (i.e. Bleeding and Poison), you still need a way to apply those Ailments (e.g. a source of Bleeding or Poison chance).

Your Pre-mitigation Damage is the damage of your hits after all your modifiers to damage have been applied, but before the target's mitigation, such as Armour, Resistances or Blocking, prevents any of that damage.

The target's modifiers to Damage taken apply after their mitigation, so Pre-mitigation Damage also does not include the effects of those modifiers. However, modifiers that cause the target to take damage as a different Type occur before mitigating the damage, so are included in Pre-mitigation Damage.

This weapon's hits will not roll a random value between the minimum or maximum damage value, but instead will always roll either the minimum value or the maximum value, with a 50% chance for each.

Each Damage Type has its damage value rolled separately, so if the hit deals multiple types of damage, some types may roll the maximum while others are at minimum.

If the damage rolls are Lucky, that will still apply, make this roll twice and picking the maximum if either roll had that result, only picking minimum damage if both rolls selected minimum. Unlucky damage rolls will prefer minimum damage in the same way.

Players possessed by the Spirit Of The Serpent have All Damage from Hits Contributes to Poison Magnitude, Always Poison on Hit and 80% increased Damage.
Players will also be accompanied by Spiritual Snakes that periodically strike enemies.

Players possessed by the Spirit Of The Primate have All Damage from Hits Contributes to Chill Magnitude, 60% Increased Freeze Buildup and 80% increased Damage.
Players will also periodically summon a group of spiritual Primates.