Extinctionism is the challenge to cause every possible monster in a game of NetHack to become extinct. In other words, if you kill enough monsters of one species, then that kind of monster cannot be generated anymore. A creature is extinct when 120 of its kind have been born. Once a species has become extinct, there are very few ways to create new monsters of that species. There are some exceptions, however, such as the monster spell summon nasties.
How to make creatures extinct
A creature is extinct when 120 of its kind are born. The creatures do not have to be killed to be extinct. Once extinct, a creature will never be randomly generated again.
Therefore, you can extinct a creature simply by summoning, or reverse-genociding 120 of its kind. Killing it is optional, but highly recommended.
To extinct a creature, you must create it in a way that respects extinction.
Mechanisms of monster creation can be classified in those that
- respect extinction and increment the born counter,
- do not respect extinction but increment the born counter,
- neither respect extinction nor increment the born counter.
Actions that respect extinction
- Reverse-genociding a monster.
- Casting create monster via spell, scroll or wand.
- Waiting around on a level for it to be randomly generated.
- Entering a level containing a special room such as a zoo, or beehive.
- Black puddings summoned by kicking a sink.
- Division of puddings and gremlins
- Any place where a specific monster class is specified.
Pudding and gremlin division does not increment the born counter but respects extinction. You cannot extinct puddings by dividing them, but once extinct by other means, puddings will no longer divide.
Actions that sometimes respect extinction
- Throne rooms, and sitting on/confusedly looting thrones.
- Graveyards and reading the cursed Book of the Dead.
- If every species of ant are extinct, the random monsters that replace them will not respect extinction.
- Shrieker summoning.
- Purple worms will not respect extinction if explicitly rolled. If they are selected as part of a random monster roll, on the other hand, they will respect extinction.
- Demon summoning
- Only unique demons will respect extinction when generated by this method.
- Spider webs
- Spider webs generated as dungeon features will not respect extinction, and will always have a spider under them.
Actions that do not respect extinction
- Bees in a beehive (queen bees, killer bees)
- Cockatrice nests
- Leprechaun halls
- Summon nasties monster spell
- Troll regeneration (does not increment the born counter)
- Scroll of create monster while confused (acid blobs)
- Keystone Kops summoned when you've stolen from a shop
- Quest themed monsters when replacing ordinary random monster generation in that dungeon branch
- Golems created from polypiling
- Using a figurine (except for the special cases described below)
- Any place where a specific monster species is specified.
Because the most common methods of extinctionism rely on monster generation, unique monsters are ignored by some extinctionists. However, unstoning a statue of a monster will increase the monster count for purposes of extinction; as a result, even unique monsters can be extincted in this sense. Also, monsters that leave corpses can be revived with the undead turning spell or a wand of undead turning and re-defeated, which also increases the born count.
You can only extinct a species if you can make enough victims. So you have to generate monsters, find a corpse to revive and kill, or repeatedly stone one. Life-saved monsters will not increment the born and kill counters.
Keystone Kops do not become extinct even after 120 of each kind have been created.
Play styles for an extinctionist
The easiest way to play an extinctionist is to play as a wizard. The wizard has the ability to cast create monster with no hunger penalty, and with the Eye of the Aethiopica he can cast virtually indefinitely. There is no reason another class couldn't do extinctionism; it would simply be more challenging.
An alternative to the Eye is confused throne looting. Once extinct, the typical throne room population is replaced by ordinary random monster creation. You can generate as many monsters as you like, for free, at any rate you like, without even breaking conducts. However, killing the monsters is slower due to confusion, so several strong pets might be a good plan. The drawback is pet kills will not generate death drops.
Once you have the Eye, make sure to gather up all the various resistances, including magic resistance, and reflection. It would be very bad to lose your character to a random gnome with a wand of death. Make sure you have a decent set of armor, and a good weapon as well.
A common method to rack up kills is to build a boulder fort around an altar. Then stand behind the altar and cast create monster over and over, while killing the resulting monsters and sacrificing them to your god.
You can either just summon monsters and kill them at random, or try to control your summoning.
Controlling your summoning can be done by carefully regulating your own experience level, and picking which dungeon level to summon the monsters on. By keeping your experience level low, you force the game to only summon monsters of a particular difficulty or lower. In this way you can wipe out all the lower level monsters, casting and killing until create monster fails. You can then move down a dungeon level or gain an experience level to increase the monster difficulty.
Erinyes become extinct after 3 have been created and Nazgul become extinct after 9 have been created, as would be expected based on their respective sources (although not all authors held the Erinyes to number three).
- dokick.c in NetHack 3.4.3, line 956
- makemon.c in NetHack 3.4.3, line 679
- There is code to extinct them shk.c, line 3435, but wizard mode testing confirms you can have as many Kops as you like. This is because propagate in makemon.c never marks non-randomly-generated (G_NOGEN) monsters such as Kops as extinct.