Cold

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This article is about the element sometimes known as frost. For other uses of the term, see Frost (disambiguation).

Cold, also referred to as frost, is a damage type that occurs in NetHack, and is capable of freezing targets and vulnerable items.

Cold damage sources

Cold damage can occur from various sources:

Various monsters also have cold-element attacks, which use the AD_COLD damage type flag:

Cold damage effects

Cold damage can destroy potions in the open inventory of a hero or monster subjected to it, dealing +d4 damage for each shattered potion.[2][3]

Cold rays and explosions can destroy doors, freeze affected pools and moats of water into ice, and cool and solidify affected squares of lava into normal rock floor[4][5][6][7][8][9]—cold rays that freeze water and lava will have their range reduced.[10] Water on the Plane of Water cannot be turned to ice by any means.[11]

Ice formed from cold rays and explosions is likely to be temporary: any temporary ice created this way will melt back into water after 50-2000 turns, and any temporary ice affected by a cold ray or explosion will have its duration increased.[12][13][14][15][16] Monsters hiding in water or lava that is frozen will be forced out of hiding. Any items that were submerged in a frozen square of water or lava are buried in the resulting ice or solid rock, while Rider corpses, the invocation items and the Amulet of Yendor will be placed on top of that square instead.[17][18][19]

Magic cancellation can block the effects of melee cold attacks that do not engulf, and cancellation disables the frosty effects of those attacks.

Flesh golems subjected to cold damage will become slower.[20]

The following information pertains to an upcoming version (NetHack 3.7.0). If this version is now released, please verify that the information below is still accurate, then update the page to incorporate it.

Per commit eb22a810, item destruction caused by cold damage is dependent on the amount of damage dealt, with the amount of items in open inventory that are affected being equal to 1⁄5 of the cold damage inflicted.

Resistance and vulnerability

Cold resistance is a property that protects a hero or monster from cold damage by reducing or nullifying the amount of damage dealt, though it does not necessarily protect their items from destruction by cold damage.

Monsters that have fire resistance but do not have cold resistance are considered to have a vulnerability to cold, taking roughly 57% more damage from cold rays (+1d3 for each 1d6), as well as double damage from frosty explosions[21][22]—this does not apply to a hero, even if they polymorph into a monster vulnerable to cold.

The following information pertains to an upcoming version (NetHack 3.7.0). If this version is now released, please verify that the information below is still accurate, then update the page to incorporate it.

Per commit b98a70e3, dwarvish cloaks protect items in open inventory from cold damage 9⁄10 of the time.

Per commit 9942b65d, extrinsic cold resistance protects items in open inventory from freezing and shattering 99⁄100 of the time, with a separate roll for each item that would be destroyed.

Strategy

A hero can prevent cold damage from destroying their potions by stashing them in a bag or other container, and cold rays and breath weapons can be deflected by any source of reflection.

While cold resistance is not as immediate a concern for a hero as various other properties like reflection or even poison resistance, it is still very useful to have since cold-based hostiles can appear early in the game, and winter wolves and their cubs can make short work of an unfortunate hero. Asmoedus in particular is a massive cold resistance check with his cone of cold spell: without the property, a hero can take nearly 200 points of cold damage, enough to wipe out otherwise-prepared characters in two or three castings.

History

Cold as a damage type is present in Hack 1.21 and Hack for PDP-11, which are based on Jay Fenlason's Hack, and is also present in Hack 1.0.

In NetHack 3.4.3 and previous versions, including some variants based on those versions, ice created by cold rays and explosions lasts indefinitely.

Messages

The water freezes.
A pool of water was frozen by a cold ray or explosion.
The moat is bridged with ice!
A moat of water was frozen by a cold ray or explosion.
You hear a crackling sound.
As above, while outside of your sight.
The door freezes and shatters!
A door was destroyed by cold.
You feel cold.
As above, while outside of your sight.
The <bolt of cold/blast of frost> hits you!
You were hit by a cold ray.
You don't feel cold.
You were hit by a ray of cold, but have cold resistance.
The <bolt of cold/blast of frost> whizzes by you!
A cold ray missed you while passing through your square.
You imitate a popsicle!
You zapped yourself with a ray of cold.
You feel a little chill.
As above, while cold resistant.
Your <potion> freezes and shatters!
A potion in your open inventory was frozen by cold damage.
<One/Some/All> of your <potions> freeze(s) and shatter(s)!
A stack of potions in your open inventory was partly or completely frozen by cold damage.
You're covered in frost!
You were hit by a cold melee attack.
The frost doesn't seem cold!
As above, but you have cold resistance.
You are freezing to death!
You were engulfed by an ice vortex.
You are suddenly very cold!
You were hit by a passive cold attack.
You feel mildly chilly.
You were engulfed by an ice vortex or hit by a cold passive attack while you have cold resistance.
The water freezes for a moment.
A cold ray or explosion affected water squares on the Plane of Water.
You hear a soft crackling.
As above, while outside of your sight.

Variants

Variants of NetHack that add object property systems include cold as a potential object property for weapons and sometimes armor.

SLASH'EM

SLASH'EM adds the Ice Mage, a role that specializes in mastery of cold, and includes more sources of cold damage:

GruntHack

In GruntHack, "frost" is one of many object properties available for weapons.

UnNetHack

UnNetHack adds the cold trap, which is primarily found in Sheol, and deals cold damage in a manner similar to a fire trap.

dNetHack

In dNetHack, notdNetHack, notnotdNetHack, the freezing, frosted and crystalline object properties grant cold damage to weapons and certain types of armor.

Randomized gaze attacks often include cold as one of the possible damage types.

The eldritch style knightly stance can be used to add cold damage to wielded weapons via the cone of cold spell, at the cost of some power.

Some artifacts deal cold damage:

  • Cold Soul is a lawful intelligent artifact whose base item is a large ranseur with a 1⁄4 chance of causing cold explosions centered on a target monster upon each hit.
  • The Bow of Skadi is a lawful artifact whose base item is a bow with +1 to-hit and +1d24 cold damage bonuses to arrows fired from it, and the arrows cause a 6d6 freezing explosion centered on any target they hit. using up the arrow.

DynaHack

In DynaHack, "frost" is one of many object properties available for weapons.

FIQHack

In FIQHack, "frost" is one of many object properties available for weapons.

EvilHack

In EvilHack, the "frost" object property grants cold damage to weapons with the property, while armor with the "frost" object property grants cold resistance.

The Hand of Vecna and Dichotomy are artifacts that can inflict cold damage.

Worn dragon-scaled armor made using white dragon scales grants the wearer a passive cold attack.

Some monsters are vulnerable to cold damage, and the vulnerability can also be inflicted with the vulnerability monster spell by clerical casters.

A hero in the Ice Queen's Realm that does not have full cold resistance will take partial cold damage each turn.

Hack'EM

In Hack'EM, the "frost" object property behaves as in EvilHack, as does the vulnerability monster spell.

References

  1. ↑ src/mhitu.c in NetHack 3.6.7, line 319: engulfing attacks have a grace period after release where a target cannot be immediately re-engulfed; engulf attacks that hit during this period become touch attacks
  2. ↑ src/zap.c in NetHack 3.6.7, line 4827
  3. ↑ src/zap.c in NetHack 3.6.7, line 5068
  4. ↑ src/zap.c in NetHack 3.6.7, line 4482
  5. ↑ src/zap.c in NetHack 3.6.7, line 4493
  6. ↑ src/zap.c in NetHack 3.6.7, line 4498
  7. ↑ src/zap.c in NetHack 3.6.7, line 4501
  8. ↑ src/zap.c in NetHack 3.6.7, line 4508
  9. ↑ src/zap.c in NetHack 3.6.7, line 4634
  10. ↑ src/zap.c in NetHack 3.6.7, line 4497
  11. ↑ src/zap.c in NetHack 3.6.7, line 4486
  12. ↑ src/zap.c in NetHack 3.6.7, line 4363
  13. ↑ src/zap.c in NetHack 3.6.7, line 4370
  14. ↑ src/zap.c in NetHack 3.6.7, line 4401
  15. ↑ src/zap.c in NetHack 3.6.7, line 4544
  16. ↑ src/zap.c in NetHack 3.6.7, line 4550
  17. ↑ src/zap.c in NetHack 3.6.7, line 4507: calls bury_objs() in dig.c, which then calls bury_an_obj() within the same file
  18. ↑ src/dig.c in NetHack 3.6.7, line 1823: bury_an_obj() function
  19. ↑ src/dig.c in NetHack 3.6.7, line 1842: per the explanation provided for the line below, Rider corpses and un-stashable objects will not be buried
  20. ↑ src/mon.c in NetHack 3.6.7, line 4041
  21. ↑ src/explode.c in NetHack 3.6.7, line 442: double damage from cold explosions
  22. ↑ src/zap.c in NetHack 3.6.7, line 3649: extra damage from cold rays
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