Ignite, bleed and poison are damaging ailments. A damaging ailment deals damage over time based on the skill’s base damage that inflicts the ailment. Only the damage types that can inflict a damaging ailment are used as a basis for calculating the damage over time for that ailment. From a previous example, a hit of physical and fire damage can potentially inflict bleed, poison and ignite. In this example, only the fire portion of the base damage is considered for ignite.
Damage with hits and damage with ailments are calculated separately and have different modifiers:
Modifiers to damage with ailments do not contribute to the damage of attacks or spells. Similarly, modifiers to attack damage and spell damage do not affect damage with ailments.
Modifiers to damage with weapons, melee damage, projectile damage and area damage do not apply to ailments under any circumstances.
Modifiers to damage with ailments, damage over time modifiers, and generic damage modifiers all apply to damaging ailments.
Modifiers to damage with specific ailments apply only to those ailments. Damage type modifiers apply to ailments that deal those types of damage.
Additionally, burning damage modifiers apply to ignite, since ‘burning damage’ simply means fire damage over time. Resistances apply to damage of the corresponding types dealt by ailments.