Stoning

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In NetHack, stoning or petrification is the process of a hero or monster turning to stone and becoming a lifeless statue.

Description

Stoning can occur either instantaneously or as a form of delayed instadeath - both forms of stoning can be reversed by life saving. All potential causes of stoning in NetHack are related to one of three monsters:

  • The c cockatrice, which can induce delayed stoning through its attacks, lays eggs that can do the same when consumed by the hero, and can instantaneously petrify any monster that makes bare-skin contact, even with its corpse or tinned meat;
  • The c chickatrice, which is a juvenile cockatrice that appears much earlier and poses many of the same threats as the adult cockatrice, but cannot lay eggs and leaves corpses much less often; and
  • @ Medusa, whose gaze and flesh can petrify the hero.

The term "footrice" can refer to either the chickatrice, the cockatrice or both monsters, due to the similarities they share.

Stoning resistance is a property that prevents either form of stoning from occurring. Golems do not possess stoning resistance except for the stone golem, but any other golem that would be petrified will instead transform into a stone golem, including a hero in the form of a golem.

Instant stoning

Instant stoning immediately turns the hero into a statue. All forms of stoning are instantaneous against monsters, unless they are capable of curing it when it occurs. Instant stoning can occur from any of the following actions:

  • Attacking a live footrice through any of the following methods:
    • Unarmed 'weapon' attacks while not wearing gloves - this includes bare-handed attacks, attacking with wielded potions, claw attacks, and touch attacks.
    • Engulfing - this applies solely to digestion attacks in practice, as all other monsters with engulfing attacks possess stoning resistance; digesting Medusa will also turn the attacker to stone.
    • Holding attacks while not wearing gloves and a cloak.
    • Kicking via the command or monster attack while not wearing boots.
    • Using headbutt attacks while not wearing a helm.
    • Bite or sting attacks, including the seduction attack of a foocubus (which is AT_BITE).
    • Tentacle attacks, including the brain-sucking attacks of a mind flayer or master mind flayer.
  • Attempting to saddle a live footrice without wearing gloves, or else having the hero's steed polymorphed into one while they are riding it.
  • Attempting to untrap a live footrice from a pit or spiked pit without wearing gloves.
  • Picking up, throwing, firing, or wielding a footrice corpse without wearing gloves.
    • This includes having worn gloves removed or destroyed while wielding the corpse, or else polymorphing from a form with stoning resistance to one without the property while wielding one.
  • Placing a footrice corpse in a container or remove it from a container without wearing gloves.
  • Kicking a footrice corpse without wearing boots.
  • Falling into a pit, spiked pit, hole, trap door, or the stairs (from fumbling, bring encumbered, or being punished) while wielding one.
  • Flying down a hole or trap door while wielding one.
  • Falling onto a sink while levitating or flying and wielding one.
  • Tripping over a footrice corpse on the ground while fumbling without wearing boots.
  • Eating a footrice corpse or tin.
  • Fainting from hunger while wielding a footrice corpse.
  • Snagging a wielded footrice corpse from a monster by using a bullwhip or grappling hook without wearing gloves - using the bullwhip to pick one up from the ground is fine.
  • Stealing a footrice corpse directly from a monster's inventory without wearing gloves.
  • Sacrificing a footrice corpse at an altar without wearing gloves.
  • Applying a tinning kit to a footrice corpse without wearing gloves.
  • Throwing a footrice corpse or egg directly up via < and being hit on the head by it without wearing a helm - the cause of death is listed as "petrified by elementary physics" (what goes up, must come down).
  • While blind and not wearing gloves, move onto one, teleport onto one, stop levitation on a square that has one, use near look one a square that has one, or be expelled from an engulfing monster onto a square with one. Safe-moving moving with m will not automatically cause the hero to feel on the ground.
  • Meeting the gaze of Medusa without reflection, biting into her corpse or consuming a tin of her meat.

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

Manually flying down a hole or trap door while wielding a footrice corpse will no longer turn the hero to stone.

Delayed stoning

Delayed stoning causes the hero to slowly turn into a statue over the next few turns, with the property abusing dexterity and removing intrinsic speed when it is applied.[1][2] Delayed stoning occurs from the following actions:

  • Hearing a footrice's hissing, which occurs with a 1⁄3 chance after its touch attack if the footrice is not cancelled - the hissing itself has a 1⁄10 chance of initiating delayed stoning, and will always do so on a new moon unless the hero is carrying a lizard corpse in open inventory.
  • Eating a cockatrice egg, or being hit by one thrown by a monster.
  • Being hit by a cockatrice corpse wielded by a monster.
  • The brain-sucking attacks of a mind flayer or master mind flayer - both delayed and instant stoning occur, so this is only seen if life saving prevents the instant stoning.

Delayed stoning has the following effect print the following messages based on how many turns the hero has left to live:[3][4]

Turns to live Effect Message
5 "You are slowing down." Intrinsic speed is removed.
The hero has two turns left to act.
4 "Your limbs are stiffening." Occupations are interrupted unless the hero is opening a tin (which can potentially save them from becoming a statue).[5][6]
The hero has one turn left to act.
3 "Your limbs have turned to stone." The hero's limbs are now unusable: this immobilizes them, interrupts all occupations, and also removes the wounded legs property if they are not currently riding.
2 "You have turned to stone." The hero goes deaf, and nausea and sliming are aborted.
0-1 "You are a statue." The hero has become a lifeless statue - if the hero has life saving, it will activate and revive them. Otherwise, the game ends.

Curing delayed stoning

The following actions by the hero can cure stiffening and completely reverse delayed stoning:

A worn amulet of life saving does not cure delayed stoning, but reverses its effects after the hero becomes a statue.

Monsters that are subjected to stoning will attempt to cure it immediately if they have a means to:

  • Monsters can use lizard corpses as defensive items, and will eat lizard meat to cure stoning.[9] Monsters with a tin of lizard meat that are being turned to stone have a 2⁄3 chance of opening it.[10] A monster with intrinsic speed loses the intrinsic if it eats a lizard corpse, even if it was not done to cure stoning.[11][12]

Strategy

Stoning is one of the more commonplace causes of YASD, with a majority of them tied to footrices. It is important for every hero to recognize when the danger of stoning is present, and be able to act promptly if they are subjected to delayed stoning - most players set MSGTYPE strings in their options to stop the action when a message related to stoning or any stoning sources is printed.

Naturally, one of the best methods to deal with any form of stoning is to avoid it in the first place: wearing gloves is strongly recommended when dealing with footrices, and a source of blindness or reflection will block Medusa's gaze. Lizard corpses never rot or become tainted - it is always worth carrying at least one or two in open inventory for emergencies, even as a hero observing the vegetarian or vegan conduct. Curing stoning also does not require that the hero finish the corpse, and whatever was turning them to stone will likely interrupt the process, so a single lizard corpse can save the hero from stoning a few times before it is fully consumed.

One of the more critical factors in being able to cure stoning is the ability to act quickly: the process takes 5 turns and robs the hero of intrinsic speed, and being burdened or worse will further reduce what little time they have to act. If at all possible, try to remain unencumbered and keep a backup source of speed on hand - if you are encumbered from using a bag or other container to carry a lot of items, you should ideally be able to drop it at a moment's notice if you encounter a stoning threat. An extrinsic source of speed is not required, but can prove convenient, and keeping track of prayer timeout is valuable as well; if all else fails, a worn amulet of life saving can reverse the process. Eating a glob of green slime is a last resort, since the hero will then have to cure the sliming process before it irreversibly transforms them.

For heroes determined to maintain vegan or vegetarian conducts, identifying and holding onto potions of acid, being able to reliably cast stone to flesh, or obtaining and blessing tins of acidic monsters are some viable alternatives - all of these methods also have significant tradeoffs, however:

  • Potions of acid are rare to come across, and most monsters that generate with the potions or find them will throw them at you to inflict damage. Keeping them in open inventory also exposes them to possible destruction from fire and cold damage, as well as losing them by accidentally stepping into a moat or pool (which causes acid to react and explode).
  • The stone to flesh spells requires the hero to increase their skill in healing spells, as well as being able to reduce the spell's failure rate to 0% and have 15 energy in order to cast it. This is generally most feasible for casting-focused heroes, and even then the most likely roles that can reliably turn to this spell are Healers, Priests and Wizards. Additionally, the spell will turn mineral items in the hero's open inventory into ineffective meat, though this is preferable to becoming a statue with all your possessions intact.
  • Relying on tins requires a blessed tin opener and/or a blessed tin, both of which should be in open inventory to save valuable time; a blessed tin opener immediately opens a tin in one action, while a blessed tin will open in 0-1 turns without a blessed tin opener (and introduces the possibility of being interrupted).[13] Applying the tin opener will wield it without taking a turn, provided you then immediately open a tin.

Monsters with stoning resistance

Main article: Stoning resistance

In addition to lizards, the following monsters have stoning resistance, allowing a hero to potentially save themselves from delayed stoning by polymorphing into them, or else by eating their corpse or tin:

History

From Hack 1.0 to Hack 1.0.2, stoning is only possible from a cockatrice's hissing, and is an instadeath if it occurs. Hack 1.0.3 introduces gradual stoning, and gives lizard corpses their anti-stoning functions.

Variants

SLASH'EM

In SLASH'EM, there are two additional monsters that cause stoning: the thick-hided basilisk, and the asphynx, which can hide under objects and stone an unsuspecting player. Both are significantly higher-level than the cockatrice; on average, fights against them will be longer, increasing the chance that one of their attacks may start turning you to stone. They also use different glyphs, meaning that a blessed scroll of genocide is no longer an easy solution.

SLASH'EM also introduces the amulet versus stone, which will save your life against stoning in the same manner as an amulet of life saving, costing a point of constitution and incrementing the "killed" counter. The amulet, however, is not destroyed in the process unless it is cursed; otherwise, its beatitude changes from uncursed to cursed, or from blessed to uncursed. Thus, with a sufficient supply of holy water, one amulet can prevent many stoning YASDs.

UnNetHack

In UnNetHack, stoning resistance is conferred by chromatic dragon scales and chromatic dragon scale mail.

dNetHack

dNetHack introduces several new acidic monsters, whose corpses can cure stoning:

In addition, all varieties of cave lizard and giant turtles will cure stoning.

Monks gain intrinsic stoning resistance at level 27.

FIQHack

In FIQHack, external resistance to stoning is provided by yellow dragon scales (or yellow dragon scale mail), in addition to the usual acid resistance.

References

  1. ↑ src/timeout.c in NetHack 3.6.7, line 125
  2. ↑ src/timeout.c in NetHack 3.6.7, line 158
  3. ↑ src/timeout.c in NetHack 3.6.7, line 125: stoned_dialogue()
  4. ↑ src/timeout.c in NetHack 3.6.7, line 102: messages for stoning process
  5. ↑ src/timeout.c in NetHack 3.6.7, line 132: checks against Popeye in eat.c
  6. ↑ src/eat.c in NetHack 3.6.7, line 3337: "Popeye" case for lizard and acidic corpses
  7. ↑ src/eat.c in NetHack 3.6.7, line 708: lizard corpses
  8. ↑ src/eat.c in NetHack 3.6.7, line 737: acidic corpses
  9. ↑ src/muse.c in NetHack 3.6.7, line 367
  10. ↑ src/muse.c in NetHack 3.6.7, line 376
  11. ↑ src/muse.c in NetHack 3.6.7, line 999
  12. ↑ src/muse.c in NetHack 3.6.7, line 2301
  13. ↑ src/eat.c in NetHack 3.6.7, line 1469
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