Pestilence

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Pestilence, &, is a unique monster that appears in NetHack. Pestilence is one of the three Riders: they are strong, have infravision, can see invisible, can be seen via infravision, are capable of flight and regeneration, and will revive from their corpse if destroyed - the revival has a 13 chance of occurring each turn, with a guaranteed revival after 500 turns, and revival always occurs in response to something that would prevent it otherwise, e.g. a tinning kit is applied to the corpse, something attempts to pick it up, or a boulder is pushed onto its square.[1][2][3] Pestilence has teleport control, which has a 1213 chance of placing them adjacent to the hero if they or their corpse are teleported (and revives them from said corpse if applicable);[4][5] they also ignore the effects of sanctuary, are unaffected by Elbereth, and can displace other monsters that are in their path unless the monster is occupying a square where a corpse cannot be generated.[6]

Pestilence has two powerful touch attacks that deal damage and inflict disease, and if both attacks land, the second attack will stun the hero[7][8] the attack has no effect on monsters, though a second successful hit damages and stuns monsters as they do the hero.[9]

Pestilence possesses many elemental resistances: fire resistance, cold resistance, shock resistance, poison resistance, and stoning resistance. Pestilence is healed by the potion of sickness and will quaff the potion to restore HP, and they are damaged by healing, extra healing, and full healing as well as the spells of healing and extra healing[10][11][12]—the potion's effects are always completely resisted by Pestilence's 100 MR score, and the spells deal 3d4 or 3d8 damage respectively, which is always halved due to their MR score as well. Disintegration will simply cause Pestilence to instantly reintegrate.

Eating Pestilence's corpse abuses wisdom and is instantly fatal, including digestion attacks and attempting to eat their brain as a mind flayer or master mind flayer, and Pestilence will immediately revive from its corpse even if the eater survives via life saving.[13][14] If the corpse is somehow eaten by a hero without reviving, they always gain teleport control.

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 017a8687, Pestilence's attack deals damage and inflicts disease against monsters without sickness resistance, as part of resolving issue #594.

Per commit 43f42b35, healing potion effects against Pestilence no longer depend on MR score, and will reliably halve Pestilence's current HP.

Generation

Pestilence is always generated hostile, and is not a valid form for polymorph. They are always created with 10d8 maximum HP, and their current maximum HP is preserved upon death for revival.[15]

Pestilence is always generated on the Astral Plane, where they are placed in the center of one of the three round rooms at level creation. They are always generated with a stack of potions of sickness.[16]

Pestilence always leaves a corpse upon death.

Strategy

Pestilence is generally considered the most dangerous of the Riders: in addition to the standard full monster MR and -5 AC, their disease-inducing attacks are very difficult (if not impossible in practical play) to obtain resistance for, and the stunning that often occurs makes the sickness more difficult to cure. One of the many reasons that players shed as much excess inventory as possible on the Plane of Water beforehand is that a burdened hero will often quickly find themselves with very few turns to live if they encounter Pestilence. Players often use telepathy to identify which altar is guarded by Pestilence, and then explore the other altars first in hopes of avoiding an encounter - as the primary objective is to find the high altar of the hero's alignment and ascend, it is generally unwise to get bogged down in killing Pestilence and the Riders repeatedly outside of bragging rights strategies.

The quickest way to deal with Pestilence is to successfully hit them with a wand of death or the finger of death spell - when killing them for the first time, be sure to dispose of their potion supply quickly afterward. Like the other Riders, Pestilence can also be dispatched quickly with high damage output, preferably from any ranged weapon in order to avoid contending with sickness-inducing touch, and the expensive camera can scare them off. Spellcasting heroes with a high experience level and access to the magic missile spell can bring Death down in a few shots (especially with rebounds), while heroes with highly-enchanted projectiles can also defeat Death with a few volleys. Melee-focused heroes can potentially defeat Pestilence fast enough, particularly if twoweaponing, but carries a high risk of the hero becoming terminally ill should they land a successful touch.

As far as bragging rights go, it is possible to tame Pestilence using the scroll of taming or charm monster spell after level draining them enough times to lower their monster MR - this typically requires several hits with Stormbringer or The Staff of Aesculapius, since their monster MR makes them immune to the drain life spell.

History

Pestilence first appears in NetHack 3.1.0, which adds the revamped endgame featuring the Riders and the Astral Plane.

In NetHack 3.4.3 and previous versions, including some variants based on them, a hero can polymorph themself into a green slime and turn Pestilence and the Riders to slime, since the sliming touch attack is not considered magical - similarly, a substantial herd of tamed green slimes stands some chance of turning a Rider into a slime, although this is only somewhat less risky; in either case, the resulting green slime can then be tamed. Additionally, a hostile gelatinous cube can engulf Rider corpses without trying to digest them, allowing the hero to steal them from the cube's inventory using a nymph polyself: a hero that can lift 1450 units of weight can use several methods to dispose of the stolen corpse permanently, such as placing it in a cursed bag of holding and then repeatedly looting it without using up any further turns.

NetHack 3.6.0 makes Pestilence and the Riders immune to sliming and polymorph, prevents gelatinous cubes from engulfing their corpses, and grants the Riders their ability to displace other monsters.

The inability for Pestilence and the Riders to displace monsters located on squares that cannot have corpses created on them (such as a closed door) is added in NetHack 3.6.3, in order to ensure that Rider corpses are created when they are killed.

Origin

Pestilence is one of the Four Horsemen of the Apocalypse (or the Riders of the Apocalypse), who appear in The Book of Revelation, the last book of most common versions of the Christian Bible. The sixth chapter of the book has verses describing Pestilence and the other Riders as they appear when the Lamb (representing Jesus) opens six of the seven seals of the Apocalypse—these quotes are cited from the New International Version:

I looked, and there before me was a white horse! Its rider held a bow, and he was given a crown, and he rode out as a conqueror bent on conquest.
Revelation 6:1-2, describing Pestilence.
They were given power over a fourth of the earth to kill by sword, famine and plague, and by the wild beasts of the earth.
Revelation 6:8-9

However, the White Horseman's identity tends to vary widely with the translation of the passages—he is sometimes given the moniker of Conquest, and other times identified as Pestilence, with the latter being far more commonplace in allegories and portrayals within contemporary literature and popular media. While the description given in the chapter's first two verses is closer to the idea of Conquest, the phrasing of the verse following their introductions does give some credence to the idea of Pestilence being one of the Horsemen.

That said, it is a matter of debate as to whether this passage refers to the fourth rider only, or to the four riders as a collective—among information cited to support the Conquest interpretation, the later appearance of Christ mounted on a white horse in Revelation 19; there is also the recurring motif of the color white, which represents righteousness and the idea of Christ as conqueror throughout the Bible as a whole; and the literal conquest of the early Christian community by the Roman Empire and/or Parthian forces created an association between their conquerors and both archery and white horses.

Vicente Blasco Ibáñez's 1916 novel, The Four Horsemen of the Apocalypse, provides an early well-known interpretation of the White Horseman as Pestilence: "The horseman on the white horse was clad in a showy and barbarous attire. ... While his horse continued galloping, he was bending his bow in order to spread pestilence abroad. At his back swung the brass quiver filled with poisoned arrows, containing the germs of all diseases."[17] NetHack is among the works that make use of this latter interpretation, as are other roguelikes such as ToME.

Messages

Who do you think you are, War?
This is the default response when chatting to a Rider.[18]
<The monster> coughs spasmodically and collapses!
A monster tried to digest Pestilence and immediately died.[19]

Encyclopedia entry

[Pestilence:] And I saw when the Lamb opened one of the seals,
and I heard, as it were the noise of thunder, one of the four
beasts saying, Come and see. And I saw, and behold a white
horse: and he that sat on him had a bow; and a crown was given
unto him: and he went forth conquering, and to conquer.

[War:] And when he had opened the second seal, I heard the
second beast say, Come and see. And there went out another
horse that was red: and power was given to him that sat thereon
to take peace from the earth, and that they should kill one
another: and there was given unto him a great sword.

[Famine:] And when he had opened the third seal, I heard the
third beast say, Come and see. And I beheld, and lo a black
horse; and he that sat on him had a pair of balances in his
hand. And I heard a voice in the midst of the four beasts say,
A measure of wheat for a penny, and three measures of barley
for a penny; and see thou hurt not the oil and the wine.

[Death:] And when he had opened the fourth seal, I heard the
voice of the fourth beast say, Come and see. And I looked, and
behold a pale horse: and his name that sat on him was Death,
and Hell followed with him. And power was given unto them over
the fourth part of the earth, to kill with sword, and with
hunger, and with death, and with the beasts of the earth.

[ Revelation of John, 6:1-8 ]

References