Difference between revisions of "Trap"
m (Add rework to Tomb and Zot:5 trap placement) |
(Completely rewrite the article to be up to date with the trap changes in 0.23. Need a tile for non-permanent teleport traps and bolt traps. Comment out monsters section because I'm not convinced it's correct.) |
||
Line 1: | Line 1: | ||
− | {{ | + | {{version023}} |
− | '''Traps''' (represented by '''[[^]]''') are [[Dungeon features]] that harm | + | '''Traps''' (represented by '''[[^]]''') are [[Dungeon features]] that harm the player or [[monster]]s who step on them. There are two types of traps: physical traps which are always revealed to the player, and exploration-triggered traps which are triggered by the player randomly during exploration. Most traps are magical in nature, but some vaults may also place mechanical ones. |
− | == | + | ==Physical traps== |
− | + | Physical traps are always revealed to the player (but not necessarily to monsters). They can only be triggered by the player, or by monsters when they are in [[line of sight]] of the player. Flying creatures trigger traps in the same way as non-flying creatures. | |
− | [[File: | + | There are six types of physical trap that generate randomly throughout the [[Dungeon]] and its branches: |
+ | * '''[[Teleport trap]]s''', which teleport anything that steps on the trap while in line of sight of the player to a different location on the current level. Destroyed when triggered. | ||
+ | * [[File:Alarm_trap.png]] '''[[Alarm trap]]s''', which make an extremely loud noise and apply [[Sentinel's Mark]] to the player when the player or any monster steps on the trap. Destroyed when triggered. | ||
+ | * [[File:Shaft.png]] '''[[Shaft]]s''', which will cause monsters to fall 1-3 floors to a lower floor in the current branch when a monster steps on the shaft and fails a chance based on their intelligence and hit dice. Players can step on shafts safely, and pressing '''>''' will cause the player to fall through the shaft if they wish. Destroyed when triggered. | ||
+ | * [[File:Dispersal_trap.png]] '''[[Dispersal trap]]s''', which blink the player and all monsters in line of sight of the trap when the player or a monster steps on the trap. These traps are permanent. | ||
+ | * [[File:Zot_trap.png]] '''[[Zot trap]]s''', which cause random harmful effects to the player, possibly including teleporting them, creating dangerous summoned or durably summoned monsters, causing an explosion dealing damage to the player, or invoking dangerous levels of [[magical contamination]], when the player or any monster steps on the trap while in line of sight of the player. When monsters step on the trap, there is only a chance for the player to be affected—this is indicated by the message "The power of Zot is invoked against you!". These traps are permanent. | ||
+ | * [[File:Web.png]] '''Webs''', found most commonly in the [[Spider's Nest]], can cause the player and non-[[List of spiders|spider]] monsters to become trapped and be given the Held status, halving their [[evasion]] and preventing melee and ranged combat. These traps are permanent, with the exception of those created by [[jumping spider]]s, which are temporary and destroyed when the player breaks or blinks out of them. | ||
− | [[ | + | There are three more types of physical trap that can only be generated by [[vault]]s, most notably being seen in the [[hall of Zot]] on [[Zot:5]] and the [[Tomb]]: |
− | + | * [[File:Teleport_trap.png]] '''Permanent teleport traps''', which have the same effect as regular teleport traps but are not destroyed when triggered. | |
+ | * [[File:Net_trap.png]] '''[[Net trap]]s''', which fire a [[throwing net]] at the player, with [[to-hit]] dependent on the absolute depth of the trap, when the player or any monster steps on the trap while in line of sight of the player. These traps are triggered 2/3 of the time when stepped on by the player, and are destroyed when triggered. | ||
+ | * [[File:Pressure_plate.png]] '''[[Pressure plate]]s''', which usually release monsters to surround the player when anything steps on the trap in line of sight of the player. The monsters released depend on the branch: in most branches, 8 [[redback]]s will be released. In the [[Snake Pit]], this is replaced by 8 [[black mamba]]s and [[mana viper]]s, and in the [[Realm of Zot]], this is replaced by a "klown kar"—3-8 [[Killer Klown]]s will be released. A few vaults have pressure plates that trigger different effects. These are always destroyed when triggered. | ||
− | + | There are five more types of mechanical traps that can be found exclusively in the [[Ossuary]]. With the exception of blade traps, these traps all have a limited number of shots and are destroyed once their shots run out. The player has a 1/4 chance to trigger them when stepping on them, with the exception of blade traps, which are triggered 2/3 of the time. | |
− | + | * [[File:Arrow_trap.png]] '''[[Arrow trap]]s''': fire arrows, dealing 1-15 damage to the player, or 1-7 damage to monsters. They have 3-11 shots. | |
− | + | * [[File:Blade_trap.png]] '''[[Blade trap]]s''': swing a large blade, dealing 48-76 damage to the player, or 10-38 damage to monsters. They are never destroyed. | |
− | * | + | * <!-- [[File:Bolt_trap.png]] -->'''[[Bolt trap]]s''': fire bolts, dealing 1-40 damage to the player, or 1-18 damage to monsters. They have 3-11 shots. |
− | * | + | * [[File:Needle_trap.png]] '''[[Needle trap]]s''': fire poisoned [[needle]]s, which may poison the target. They have 3-11 shots. |
− | * | + | * [[File:Spear_trap.png]] '''[[Spear trap]]s''': fire spears, dealing 1-26 damage to the player, or 1-10 damage to monsters. They have 2-7 shots. |
− | * | ||
− | |||
− | |||
− | + | ==Exploration-triggered traps== | |
− | * | + | When exploring new tiles that haven't been seen before, there is a depth-based chance that the player will trigger an exploration trap. There are three types of exploration trap that can be triggered: |
− | + | * '''Alarm trap effect''': the same as if the player stepped on an alarm trap; causes an extremely loud noise and [[Sentinel's Mark|marks]] the player. This effect cannot be triggered on D:1 or D:2. | |
− | * | + | * '''Shaft effect''': the same as if the player voluntarily took a physical shaft; causes the player to fall 1-3 floors deeper in the branch with no immediate way to return to the higher floor. This effect cannot be triggered while standing on stairs or some other dungeon features, in the [[Tomb]], [[Pandemonium]], on the last floor of any branch, or on the second-last floor of all branches except the [[Dungeon]], [[Lair]], [[Orc]] and [[Depths]], and you cannot be shafted from a higher floor into the last floor of any branch except the [[Dungeon]], [[Lair]], [[Orc]] or [[Depths]]. |
− | + | * '''Teleport effect''': causes you to be teleported to a random location on the current floor that is next to monsters, like the [[teleportitis]] mutation. This effect will fail to trigger if the game cannot find any such locations on the current floor. | |
− | |||
− | |||
− | * | ||
− | + | Worshippers of [[Ashenzari]] are completely immune to these effects. | |
− | == | + | ===Chance to trigger=== |
− | + | The chance for each of the alarm trap, shaft and teleport traps to trigger when an exploration trap effect is rolled is 1/3 for each. | |
− | + | The chance for a given turn exploring new tiles is: | |
− | |||
− | |||
− | |||
− | + | (number of floor tiles revealed on this turn / number of floor tiles on current level) * (1 + absdepth of current level/10) / 9 | |
− | |||
− | |||
− | * | ||
− | |||
− | {| class="prettytable" | + | The chance for one or more exploration traps to trigger on a given level is therefore simply <code>(1 + absdepth/10) / 9</code>. |
− | ! | + | This leads to the following chances of the game attempting to trigger one or more exploration-triggered traps on any given level: |
− | + | {| class="prettytable" | |
− | + | ! Branch !! Chance per floor | |
− | + | |- | |
− | + | | D:1-9 || 1/9 | |
− | + | |- | |
+ | | D:10-15 || 2/9 | ||
+ | |- | ||
+ | | Lair || 2/9 | ||
+ | |- | ||
+ | | Orcish Mines || 2/9 | ||
+ | |- | ||
+ | | Elven Halls || 2/9 | ||
+ | |- | ||
+ | | Swamp/Shoals/Snake Pit/Spider Nest || 2/9 | ||
|- | |- | ||
− | | | + | | Slime:1-2 || 2/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Slime:3-5 || 3/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Vaults || 3/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Depths || 3/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Crypt || 3/9 |
− | | | ||
− | | 3 | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Tomb || 3/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Pandemonium || 3/9 |
− | | | ||
− | | 3 | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Hell || 3/9 |
− | | | ||
− | | 3 | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Geh/Coc/Tar/Dis:1 || 3/9 |
− | |||
− | |||
− | |||
− | | | ||
− | | | ||
|- | |- | ||
− | | | + | | Geh/Coc/Tar/Dis:2-7 || 4/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|- | |- | ||
− | | | + | | Zot:1-2 || 3/9 |
− | |||
− | |||
− | |||
− | | | ||
− | | | ||
|- | |- | ||
− | | | + | | Zot:3-5 || 4/9 |
− | | | ||
− | | | ||
− | |||
− | |||
− | |||
|} | |} | ||
+ | The above chances are for the game to attempt to trap the player. Given that there are many situations when the shaft and teleport effects can fail, this does not accurately reflect the chance of actually being trapped on a given floor. Situations when a particular trap effect fails are not announced. | ||
− | + | <!-- Commented out because I'm not at all convinced that this is correct -- NormalPerson7 | |
+ | ==Monsters & Traps== | ||
+ | Different monsters react differently to traps. Most monsters with animalistic intelligence or above will avoid ones they know about, and refuse to cross a trap that is harmful to them even if there is no other way to reach you. [[Monster_intelligence|Mindless]] monsters like [[zombie]]s will walk through traps regardless of how much damage it might cause them. | ||
+ | |||
+ | In some situations, monsters already know the locations of traps: | ||
+ | *Monsters native to a [[dungeon branch]] (eg. [[orc]]s in the [[Orcish Mines]]) already know the locations of all traps in their branch, since they live there. | ||
+ | *Monsters friendly to the player, and good neutrals, know the location of all traps, since it's assumed that you would tell them about the traps. | ||
+ | *Monsters with human [[intelligence]] or greater have a 1 in 3 chance of knowing about the existence of any single trap. | ||
+ | --> | ||
==Obsolete Traps== | ==Obsolete Traps== | ||
Over the years, many traps have been removed from the game for various reasons. These include: | Over the years, many traps have been removed from the game for various reasons. These include: | ||
− | *'''[[Shadow trap]]s''' ( | + | *'''[[Shadow trap]]s''' (Added in [[0.16]], removed in [[0.17]]) |
*'''[[Gas trap]]s''' (Removed in [[0.13]]) | *'''[[Gas trap]]s''' (Removed in [[0.13]]) | ||
*'''[[Axe trap]]s''' (Removed in [[0.11]]) | *'''[[Axe trap]]s''' (Removed in [[0.11]]) | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
==History== | ==History== | ||
− | + | *Dispersal traps were added in [[0.23]]. Prior to [[0.23]], exploration-triggered traps did not exist, and physical traps were not always revealed to the player—instead, the player had an XL-based chance to detect physical traps and so would sometimes stumble into these traps. Worshippers of [[Ashenzari]] had an increased chance to detect these traps. Alarm and net traps did not affect the player when monsters stepped on the trap, and the trap layout in the [[hall of Zot]] in [[Zot:5]] and the [[Tomb]] was very different. | |
− | + | *Prior to [[0.16]], flying players and monsters could avoid triggering traps. Shadow traps were added and trap disarming was removed in this version. | |
− | Prior to [[0.16]], flying players and monsters could avoid triggering traps. Shadow traps were added and trap disarming was removed in this version. | + | *Prior to [[0.15]], mechanical traps dropped ammunition and all teleport traps were permanent. |
− | + | *Prior to [[0.13]], mechanical traps were randomly placed throughout every branch. Trap detection was based on the [[Traps]] skill*. | |
− | Prior to [[0.15]], mechanical traps dropped ammunition and all teleport traps were permanent. | + | *Prior to [[0.12]], Traps could be detected by searching (command '''s'''). |
− | |||
− | Prior to [[0.13]], mechanical traps were randomly placed throughout every branch. | ||
− | |||
− | Prior to [[0.12]], Traps could be detected by searching (command '''s'''). | ||
[[Category:Traps]] | [[Category:Traps]] | ||
[[Category:Crystal Ball Articles]] | [[Category:Crystal Ball Articles]] |
Revision as of 12:03, 3 March 2019
Traps (represented by ^) are Dungeon features that harm the player or monsters who step on them. There are two types of traps: physical traps which are always revealed to the player, and exploration-triggered traps which are triggered by the player randomly during exploration. Most traps are magical in nature, but some vaults may also place mechanical ones.
Contents
Physical traps
Physical traps are always revealed to the player (but not necessarily to monsters). They can only be triggered by the player, or by monsters when they are in line of sight of the player. Flying creatures trigger traps in the same way as non-flying creatures.
There are six types of physical trap that generate randomly throughout the Dungeon and its branches:
- Teleport traps, which teleport anything that steps on the trap while in line of sight of the player to a different location on the current level. Destroyed when triggered.
- Alarm traps, which make an extremely loud noise and apply Sentinel's Mark to the player when the player or any monster steps on the trap. Destroyed when triggered.
- Shafts, which will cause monsters to fall 1-3 floors to a lower floor in the current branch when a monster steps on the shaft and fails a chance based on their intelligence and hit dice. Players can step on shafts safely, and pressing > will cause the player to fall through the shaft if they wish. Destroyed when triggered.
- Dispersal traps, which blink the player and all monsters in line of sight of the trap when the player or a monster steps on the trap. These traps are permanent.
- Zot traps, which cause random harmful effects to the player, possibly including teleporting them, creating dangerous summoned or durably summoned monsters, causing an explosion dealing damage to the player, or invoking dangerous levels of magical contamination, when the player or any monster steps on the trap while in line of sight of the player. When monsters step on the trap, there is only a chance for the player to be affected—this is indicated by the message "The power of Zot is invoked against you!". These traps are permanent.
- Webs, found most commonly in the Spider's Nest, can cause the player and non-spider monsters to become trapped and be given the Held status, halving their evasion and preventing melee and ranged combat. These traps are permanent, with the exception of those created by jumping spiders, which are temporary and destroyed when the player breaks or blinks out of them.
There are three more types of physical trap that can only be generated by vaults, most notably being seen in the hall of Zot on Zot:5 and the Tomb:
- Permanent teleport traps, which have the same effect as regular teleport traps but are not destroyed when triggered.
- Net traps, which fire a throwing net at the player, with to-hit dependent on the absolute depth of the trap, when the player or any monster steps on the trap while in line of sight of the player. These traps are triggered 2/3 of the time when stepped on by the player, and are destroyed when triggered.
- Pressure plates, which usually release monsters to surround the player when anything steps on the trap in line of sight of the player. The monsters released depend on the branch: in most branches, 8 redbacks will be released. In the Snake Pit, this is replaced by 8 black mambas and mana vipers, and in the Realm of Zot, this is replaced by a "klown kar"—3-8 Killer Klowns will be released. A few vaults have pressure plates that trigger different effects. These are always destroyed when triggered.
There are five more types of mechanical traps that can be found exclusively in the Ossuary. With the exception of blade traps, these traps all have a limited number of shots and are destroyed once their shots run out. The player has a 1/4 chance to trigger them when stepping on them, with the exception of blade traps, which are triggered 2/3 of the time.
- Arrow traps: fire arrows, dealing 1-15 damage to the player, or 1-7 damage to monsters. They have 3-11 shots.
- Blade traps: swing a large blade, dealing 48-76 damage to the player, or 10-38 damage to monsters. They are never destroyed.
- Bolt traps: fire bolts, dealing 1-40 damage to the player, or 1-18 damage to monsters. They have 3-11 shots.
- Needle traps: fire poisoned needles, which may poison the target. They have 3-11 shots.
- Spear traps: fire spears, dealing 1-26 damage to the player, or 1-10 damage to monsters. They have 2-7 shots.
Exploration-triggered traps
When exploring new tiles that haven't been seen before, there is a depth-based chance that the player will trigger an exploration trap. There are three types of exploration trap that can be triggered:
- Alarm trap effect: the same as if the player stepped on an alarm trap; causes an extremely loud noise and marks the player. This effect cannot be triggered on D:1 or D:2.
- Shaft effect: the same as if the player voluntarily took a physical shaft; causes the player to fall 1-3 floors deeper in the branch with no immediate way to return to the higher floor. This effect cannot be triggered while standing on stairs or some other dungeon features, in the Tomb, Pandemonium, on the last floor of any branch, or on the second-last floor of all branches except the Dungeon, Lair, Orc and Depths, and you cannot be shafted from a higher floor into the last floor of any branch except the Dungeon, Lair, Orc or Depths.
- Teleport effect: causes you to be teleported to a random location on the current floor that is next to monsters, like the teleportitis mutation. This effect will fail to trigger if the game cannot find any such locations on the current floor.
Worshippers of Ashenzari are completely immune to these effects.
Chance to trigger
The chance for each of the alarm trap, shaft and teleport traps to trigger when an exploration trap effect is rolled is 1/3 for each.
The chance for a given turn exploring new tiles is:
(number of floor tiles revealed on this turn / number of floor tiles on current level) * (1 + absdepth of current level/10) / 9
The chance for one or more exploration traps to trigger on a given level is therefore simply (1 + absdepth/10) / 9
.
This leads to the following chances of the game attempting to trigger one or more exploration-triggered traps on any given level:
Branch | Chance per floor |
---|---|
D:1-9 | 1/9 |
D:10-15 | 2/9 |
Lair | 2/9 |
Orcish Mines | 2/9 |
Elven Halls | 2/9 |
Swamp/Shoals/Snake Pit/Spider Nest | 2/9 |
Slime:1-2 | 2/9 |
Slime:3-5 | 3/9 |
Vaults | 3/9 |
Depths | 3/9 |
Crypt | 3/9 |
Tomb | 3/9 |
Pandemonium | 3/9 |
Hell | 3/9 |
Geh/Coc/Tar/Dis:1 | 3/9 |
Geh/Coc/Tar/Dis:2-7 | 4/9 |
Zot:1-2 | 3/9 |
Zot:3-5 | 4/9 |
The above chances are for the game to attempt to trap the player. Given that there are many situations when the shaft and teleport effects can fail, this does not accurately reflect the chance of actually being trapped on a given floor. Situations when a particular trap effect fails are not announced.
Obsolete Traps
Over the years, many traps have been removed from the game for various reasons. These include:
- Shadow traps (Added in 0.16, removed in 0.17)
- Gas traps (Removed in 0.13)
- Axe traps (Removed in 0.11)
History
- Dispersal traps were added in 0.23. Prior to 0.23, exploration-triggered traps did not exist, and physical traps were not always revealed to the player—instead, the player had an XL-based chance to detect physical traps and so would sometimes stumble into these traps. Worshippers of Ashenzari had an increased chance to detect these traps. Alarm and net traps did not affect the player when monsters stepped on the trap, and the trap layout in the hall of Zot in Zot:5 and the Tomb was very different.
- Prior to 0.16, flying players and monsters could avoid triggering traps. Shadow traps were added and trap disarming was removed in this version.
- Prior to 0.15, mechanical traps dropped ammunition and all teleport traps were permanent.
- Prior to 0.13, mechanical traps were randomly placed throughout every branch. Trap detection was based on the Traps skill*.
- Prior to 0.12, Traps could be detected by searching (command s).