Trap

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Traps (represented by ^) are Dungeon features that harm characters or monsters who step on them. They do not appear on the map until detected, except in some vaults. Most traps are either mechanical or magical in nature.

Strategy

In the early game, traps are generally more of an annoyance than a danger, but later traps do enough damage to make it potentially hazardous to explore unknown territory on low HP. Traps can be detected by searching (command s). If you are reasonably sure there is a trap nearby, but haven't detected it yet, searching for it may be your safest bet, especially if you have a decent Traps & Doors skill.

One easy giveaway of a trap that fires ammunition is to find its ammo lying on the ground after it has been triggered by monsters; finding a couple of poisoned needles on the ground is normally a sure sign that a needle trap is there, for example. Another giveaway is finding corpses of monsters you didn't kill (though corpses can also be found in certain vaults).

You can attempt to disarm a mechanical trap by holding CTRL and pressing the key corresponding to the direction of the trap (to attempt to disarm a trap to the right of you, for example, hold CTRL and press →). There is a low chance of disarming the trap with low Traps & Doors skill, and failing to disarm is likely to trigger the trap.

Flying or levitating allows you to move over mechanical traps without triggering them.

Traps that fire ammunition have a limited supply of ammo.

Once you have detected a trap, you can (with thoughtful maneuvering) use it to harm or block monsters who are pursuing you. More intelligent monsters are much more likely to avoid them, however.

Trap Mechanics

Mechanical traps do not always go off when stepped on. The odds of setting one off are:

  • For traps the player knows about:
    • 2 in 3 chance for blade and net traps.
    • 1 in 4 chance for all other traps.
  • For traps the player does not know about:
    • Blade and net traps always go off.
    • 4 in 5 chance for all other traps.

For monsters, the odds are different:

  • For traps the monster knows about:
    • 1 in 2 chance for blade and net traps.
    • All other traps always go off.
  • For traps the monster does not know about:
    • 4 in 5 chance for blade traps.
    • 2 in 3 chance for net traps.
    • All other traps always go off.

If a mechanical trap is triggered, there is still a chance for the trap's weapon to miss, depending on your evasion and dexterity. The Repel Missiles and Deflect Missiles spells reduce the chance of a projectile hitting (except for the net trap, which drops the net rather than firing it). If you fail to evade the projectile, but are wearing a shield, you may instead block the projectile.

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 even if there is no other way to reach you. Mindless monsters like zombies will walk through traps regardless of how much damage it might cause them. Zot traps are special: if you're in sight when a hostile monster walks into one, you get zapped. ("[It] uses the power of Zot against you!")

Flying and levitation allow monsters to evade mechanical traps without triggering them, just like players.

In some situations, monsters already know the locations of traps:

  • Monsters native to a dungeon branch (eg. orcs 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 that you know about, since it's assumed that you would tell them about the traps.
  • Monsters with high intelligence or greater have a 1 in 3 chance of knowing about the existence of any single trap.

Trap Types

Notes:

  • Level refers to the current Dungeon level.
  • All ammunition produced by traps has a +0,+0 enchantment.
  • The damage caused by mechanical traps is reduced by the player's AC.
Trap Description Amount of ammo Base damage to player Base damage to monsters Trap type
Alarm trap Makes a loud noise N/A None None Magical
Arrow trap Fires an arrow 3 - 11 1 - 15 1 - 7 Mechanical
Blade trap Swings a huge swinging blade N/A 48 - 76 10 - 38 Mechanical
Bolt trap Fires a bolt 3 - 11 1 - 40 1 - 18 Mechanical
Dart trap Fires a dart 3 - 11 1 - 6 1 - 4 Mechanical
Gas trap Releases clouds of harmful gas 1 Varies by type Varies by type Mechanical
Needle trap Fires a poisoned needle 3 - 11 None, but may poison None, but may poison Mechanical
Net trap Drops a throwing net 1 None None Mechanical
Pressure plate Causes something to happen, usually bad. N/A None None Mechanical
Shaft Opens a hole under the victim, sending them to a deeper dungeon level N/A None None Natural
Spear trap Fires a spear 2 - 7 1 - 26 1 - 10 Mechanical
Teleport trap Teleports the victim to a random location on the level N/A None None Magical
Web Induces the held status for several turns May break after each use None None Mechanical
Zot trap Produces a powerful magical miscast effect N/A Varies by effect Varies by effect; only affects friendly monsters Magical

Note that the "pressure plate" trap is a "software trap"; rather than a fixed result, its effects are scripted in Lua, and might include stuff like dumping out a basket of spiders, or dropping a grating to block the path behind you.