Trolls are a class of monsters in NetHack. They are notable because the corpses of dead trolls will revive (similar to the Riders). For that reason, trolls are one of the more annoying monsters. Trolls can also make use of polearms—they can pound with one at the same range as a character who is Skilled in polearms. They have a 50% chance of being generated with either a ranseur, partisan, glaive, or spetum.
Generally speaking, for well armed characters, trolls do not pose a major threat, but preventing them from reviving can be tricky. There are a large number of ways to kill a troll permanently, many of which involve putting the corpse inside something:
- Eat the corpse. It will disappear only when you are finished. During the meal, it may revive, or you may be interrupted, or you may become unconscious from rotten food. This is a readily available option as long as you are not satiated.
- Let a pet eat the corpse. It will disappear as soon as the pet starts to eat, though this option is only available if you have a carnivorous pet.
- Tin the corpse. This is the easiest option for those with a tinning kit.
- Lock the corpse in a container. Useful for trolls generated in throne rooms, though they may revive while being carried to their destination. Nesting a container more than 2 levels deep will also prevent reviving, as will a bag of holding 97.5% of the time. You will receive the message "You feel less hassled" when a troll corpse stored in a container fails to revive.
- Just keep killing the troll. Each time you do, there is approximately a 25% chance that it will not revive.
- Place the corpse in an ice box. The revival countdown will be paused. You can take it out later when you're ready to deal with it.
- Stone the living troll with a cockatrice corpse. If there is a live cockatrice nearby, conflict can also (sometimes) induce the cockatrice to stone the troll.
- Polymorph the corpse.
- Throw the corpse into lava or water (if it isn't a water troll), and it will drown as soon as it revives.
- Sacrifice the corpse.
- Polymorph the troll and kill the creature. Make sure you're prepared in case the troll polymorphs to something like a master lich.
- Find or dig a pit, place the corpse in, and push in a boulder to bury it. Water can also be used in the place of a pit (90% chance if the troll in question is a water troll).
- Lure the troll to the Rogue level, where monsters don't leave corpses, and kill it there.
- Crush the troll with a drawbridge.
- Disintegrate the troll by standing between it and a black dragon, or just polymorph into a black dragon and fire a disintegration ray at it.
- Digest the troll.
- Turn the troll to slime.
- Genocide trolls.
- Put the corpse in a cursed bag of holding and repeatedly #loot the bag until it disappears.
- Completely fill the level with monsters so that the troll has nowhere to revive.
- Destroy the container with the corpse in it: a magical explosion for bags of holding, or polymorph for any container. Probably not worth wasting a container, though.
While not as strong as some other tamable creatures, higher-level trolls are still reasonably strong, can make use of some weapons, and can auto-revive when killed. Even though they do not always revive tame, the chance is small for them to revive hostile as long as you do not abuse them or kill them yourself. While they are not exactly so powerful that they're worth going out of your way to tame, a tame troll may still be worth keeping.
- The <troll> rises from the dead!
- A troll revived, and you could see it.
- The bite-covered <troll> rises from the dead!
- A troll revived from a partly eaten corpse (possibly while you were eating it), and you could see it.
Ordinary trolls are the weakest monsters in the troll monster class. They have no special abilities beyond reviving themselves, and they are often generated in throne rooms.
Ice trolls are immune to cold, and one of their attacks are deals cold damage. They hit slightly harder than regular trolls if the cold attack isn't resisted. They have a slightly lower AC and some MR.
Rock trolls are basically more powerful versions of ordinary trolls. They hit slightly harder than trolls and ice trolls, but have no remarkable attribute otherwise besides reviving themselves. They have lower AC than ice trolls, but no MR.
In Dungeons & Dragons, they are described as trolls with an affinity for earth that possess natural camouflage in areas of stone.
Water trolls have higher MR than other trolls, but their AC is only on par with regular trolls. They don't hit as hard as rock trolls, but they can swim, so dumping their corpse in water isn't effective at getting rid of them.
Water trolls are not randomly generated; the only natural water trolls in the game are two of them that appear in one version of Medusa's Island.
Olog-hai are the most powerful type of trolls, having lower AC than all other trolls (but no MR), and they hit as hard as rock trolls. They have no special attributes beyond reviving themselves.
The name is derived from J.R.R Tolkien's works, in which the Olog-hai were a species of trolls that served the Witch-King while he ruled in Angmar. Olog-hai did not turn to stone in sunlight as other trolls did.
Trolls originate from from Scandinavian folklore. NetHack's depiction of trolls is more directly based on Dungeons & Dragons.
In the folklore, a troll is typically large, very strong, and dim-witted. It fears light or is turned to stone by it. Trolls in D&D have regenerative abilities.
The troll shambled closer. He was perhaps eight feet tall,
perhaps more. His forward stoop, with arms dangling past
thick claw-footed legs to the ground, made it hard to tell.
The hairless green skin moved upon his body. His head was a
gash of a mouth, a yard-long nose, and two eyes which drank
the feeble torchlight and never gave back a gleam.
Like a huge green spider, the troll's severed hand ran on its
fingers. Across the mounded floor, up onto a log with one
taloned forefinger to hook it over the bark, down again it
scrambled, until it found the cut wrist. And there it grew
fast. The troll's smashed head seethed and knit together.
He clambered back on his feet and grinned at them. The
waning faggot cast red light over his fangs.
It wasn't that the troll was _horrifying_. Instead of the
rotting, betentacled monstrosity he had been expecting
Rincewind found himself looking at a rather squat but not
particularly ugly old man who would quite easily have passed
for normal on any city street, always provided that other
people on the street were used to seeing old men who were
apparently composed of water and very little else. It was as
if the ocean had decided to create life without going through
all that tedious business of evolution, and had simply formed
a part of itself into a biped and sent it walking squishily up
the beach. The troll was a pleasant translucent blue color.
As Rincewind stared a small shoal of silver fish flashed
across its chest.
But at the end of the Third Age a troll-race not before seen
appeared in southern Mirkwood and in the mountain borders of
Mordor. Olog-hai they were called in the Black Speech. That
Sauron bred them none doubted, though from what stock was not
known. Some held that they were not Trolls but giant Orcs;
but the Olog-hai were in fashion of body and mind quite unlike
even the largest of Orc-kind, whom they far surpassed in size
and power. Trolls they were, but filled with the evil will
of their master: a fell race, strong, agile, fierce and
cunning, but harder than stone. Unlike the older race of the
Twilight they could endure the Sun.... They spoke little,
and the only tongue they knew was the Black Speech of Barad-dur.
- *plonk* (for actual genocide)
- S3n7 1n s0m3 7r0llz!!! (for reverse genocide)