Fire damage

Fire damage is one of the five damage types and of the three types which count as elemental damage.

If a creature lands a critical strike with an attack or spell that deals fire damage, the ignite status ailment is inflicted. Some fire damage, including that caused by ignite, is further classified as burning and is a type of damage over time. (Note that if the source deals non-fire damage that is taken as fire by the target, the ignite will not occur due the source having no base fire damage to scale an ignite off of.)

Fire damage is mitigated by fire resistance and reduction to fire damage taken. Skills which deal or affect fire damage have the Fire gem tag. Some modifiers convert other types of damage into fire.

Skill gems
A list of gems with the gem tag: Fire

Base items
The following base items are related to fire damage:

Flat added Fire Damage
Unique items that add a flat amount of fire damage or grant to socketed skills.

Increased Fire Damage
Unique items that increase or reduce fire damage by a percentage.

Converted to Fire Damage
Unique items that convert damage to fire damage.

Added as Fire Damage
Unique items that add a portion of other damage types as fire damage.

Damage taken as Fire Damage
Unique items that takes damage as fire damage.

Add a percentage of fire damage as another damage type
Unique items that add a percentage of the fire damage as another damage type.

Converted to another damage type
Unique items that convert fire damage to another damage type.

Passive skills
There are passive skills that grant fire damage bonuses.

Fire damage
These passive skills grant increased fire damage.

Fire damage with weapons
These passive skills grant increased fire damage with weapons.

Burning damage
These passive skills grant increased burning damage (fire damage over time).

Cluster Jewel passive skills
The following Cluster Jewel passives are related to Fire Damage:

Miscellany
These passive skills are related to fire damage, but do not fit into any other category.

Timeless Jewel keystone passive skills
The following keystone passive skills are related to fire damage:

Keystone passive skills
The following keystone passive skills are related to fire damage:

Ascendancy passive skills
The following Ascendancy passive skills are related to fire damage:

Monsters
Monsters with fire damage attacks include: Some Cannibals, some Skeletons, some Snakes, Flame Sentinels, Carrion Queens, Devourers, some Bandits, some Experimenters, some Goatmans, some Hellions, some Miscreations, some Skeletal Archers, some Skeletal Mages, some Spitter, some Undyings and Voidbearers.

Bosses with fire damage attacks include:
 * Fire Fury (casts )
 * Ungulath‎ (cast supported by, )
 * The Burning Menace (deals Fire Damage, ignites ground on death)
 * Ambrosia, Daughter of Merveil ( aura, casts and )
 * Targa, Beast Poacher (Uses )
 * Alira (casts )
 * Vaal Oversoul (Slam (50% Physical, 50% Fire))
 * Hatebeat (casts )
 * The Shipyard Terror‎ (cast )
 * The Infernal Seal (casts and )
 * Banner of Passion ( aura)
 * General Gravicius (deals Fire Damage, casts, , )
 * Piety (deals Fire Damage in melee form)
 * The Conqueror Wurm (Fire projectile)
 * Draconarius Wilhelm Flamebrand (deals Fire Damage)
 * Kali the Crazed (deals Fire Damage)
 * Dominus (Ascendant phase)