Fire resistance nullifies any fire damage that you take from monster attacks and wands, but will not prevent fire damage from boiling potions or burning scrolls and spellbooks, nor will it prevent burning of non-fireproof armor. Falling in lava with fire resistance still incurs damage but prevents it from being immediately lethal, providing a limited amount of turns for you to escape it before you sink beneath its surface. Being splashed from a boulder falling into lava deals d6 damage if you have fire resistance (before half physical damage is applied) and 3d6 damage otherwise.
Fire-element monsters, some golems and most major demons are among the monsters that have fire resistance. Monsters that are resistant to fire but not to cold are considered vulnerable to cold, and take about 57% more damage from rays of cold (+1d3 for each 1d6) as well as double damage from frosty explosions. This is not applied to you, even while polymorphed into such a monster.
Intrinsic fire resistance can be obtained by crowning like all other resistance properties. Monks gain intrinsic fire resistance at experience level 11, and Priests obtain fire resistance at XL 20.
The intrinsic can also be gained by from polymorphing into the following monsters or eating their corpses or globs:
|red naga hatchling||meaty||4||10%|
|Chromatic Dragon||meaty||23||17%||poisonous, Caveman quest nemesis, nopoly|
|fire ant||meaty||6||20%||abundant on the Valkyrie quest|
|Wizard of Yendor||meaty||34||25%||cannibalism for humans, nopoly|
|fire giant||meaty||11||30%||abundant on the Valkyrie quest|
|hell hound pup||meaty||9||47%|
|Lord Surtur||meaty||19||50%||Valkyrie quest nemesis, nopoly|
|Ixoth||meaty||22||100%||Knight quest nemesis, nopoly|
Extrinsic fire resistance is granted by the following items:
- Wearing a ring of fire resistance
- Wearing red dragon scales or scale mail
- Wielding Fire Brand
- Carrying the Mitre of Holiness, the Priest quest artifact
Fire resistance as a property has existed since the many variants of Jay Fenlason's Hack. From Hack 1.02 to NetHack 3.0.10, fire resistance was required to enter Hell, which would instantly burn you to a crisp otherwise.
- You feel a momentary chill.
- You gained intrinsic fire resistance by eating a corpse or tin.
- You be chillin'.
- As above, while hallucinating.
- You feel cool!
- You gained intrinsic fire resistance through reaching a certain experience level.
- You feel warmer!
- You lost intrinsic fire resistance due to level drain or a gremlin attack.
- You feel mildly warm.
- You were hit by fire, but suffered no damage due to fire resistance.
Variants often introduce additional sources of fire resistance; object properties systems also have fire resistance as one of the many possible extrinsics that worn armor can convey.
The ward against flame technique confers temporary fire resistance when used. This is the Monk's primary source of fire resistance, available at experience level 11, and was converted to intrinsic fire resistance when the role was ported to NetHack.
In dNetHack, fire resistance gained from eating corpses is temporary, as with most other resistance properties; the duration depends on the corpse eaten.
In SlashTHEM, the fire helmet and asbestos jacket each provide fire resistance when worn. The Firefighter role starts with both of these items, and gains intrinsic fire resistance at experience level 15.