Fire damage

Fire damage refers to any attack involving heat or flame.

Causing Fire Damage
By default, Fire Wands, Fire Staves, Holy Wands, Holy Staves, and Fiery Dragon Swords cause fire damage. Additionally, most other weapons have weapon upgrades available that convert their normal damage to fire damage.

Nearly any elementalist Fire Magic skill causes fire damage. Some Smiting Prayers also cause fire damage, but they are rare. Rangers have the ability to Ignite Arrows, so they can cause fire damage as well. Fire damage skills often do area effect damage.

For a detailed list, see what causes fire damage.

Defending Against Fire Damage
Like other elemental damage, Ward Against Elements will reduce fire damage. Elementalist Pyromancer Armor has an armor bonus vs. fire damage. Additionally, any armor bonus vs. elemental damage will protect against fire damage as well. As fire damage is one of the most common damage types, it is important to have protection from it readily available.

When to use Fire
Anything aligned with earth or death will take significantly more damage from fire attacks. Anything aligned with water or fire will take significantly less damage from fire. Thus, fire damage is especially effective in Kryta and Maguuma, and particularily uneffective in post-Searing Ascalon and the Ring of Fire.