Container trap
Chests and large boxes each have a 10% chance of being protected by a container trap. If you apply, loot or kick open a trapped container, or use an unlocking tool to lock or unlock it, the trap will be set off. The #untrap command checks a container for traps, and will prompt you to disarm it if one is found. Unsuccessfully disarming a trap will also set it off.
The type of trap on a trapped container is not determined until it is set off.
Wishing for a “poisoned” large box or chest will create one that is guaranteed to be trapped.
The following information pertains to an upcoming version (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 87694e1a, a hero will remember if they discover a trap on a large box or chest, and both containers can generate as 'obviously' trapped.Disarming
Use the #untrap command on your current square (.) to search a container in that square for traps. If a trap exists on a container, the chance of actually finding it is 10/(31 − Xlvl).[1] This is a 1⁄3 chance at experience level 1, increasing to 100% at level 21. If you are confused, the chance of success is always 1⁄3. Searching for a container trap will never set it off, even if you fail to find it.
When a trap is found, you are given the option of disarming it.
Your proficiency at disarming traps is (Dex + Xlvl), which is doubled if you are a Rogue. The difficulty of a particular trap is [75 + (Dlvl/2)], based on the current dungeon level when you try to disarm the trap.
If a roll of d(difficulty) is less than or equal to your proficiency, and you are neither confused nor fumbling, the trap is disarmed (“You disarm it!”).[2] Otherwise, the trap is set off as normal. In either case the container is no longer trapped.
You can also invoke the Master Key of Thievery to remove a container trap, with no chance of setting it off.
Trap effects
When you set off a trap, there is a chance that it will be harmless. This occurs if d(13 + Luck) > 8. If so, you will randomly receive one of the following meaningless messages:[3]
- But luckily the explosive charge is a dud! (2⁄13 chance)
- But luckily the electric charge is grounded! (2⁄13)
- But luckily the flame fizzles out! (2⁄13)
- But luckily the poisoned needle misses! (3⁄13)
- But luckily the gas cloud blows away! (4⁄13)
Otherwise, a number will be chosen between 0 and 25. There is a 1⁄20 chance that this will be randomly chosen from the full range; otherwise the number will be between 0 and (13 − Luck). The effect of each result is as follows:[4]
| Number | Message | Effect |
|---|---|---|
| 21–25 | The <container> explodes! |
|
| 17–20 | A cloud of noxious gas billows from the <container>. |
|
| 13–16 | You feel a needle prick your <hand/finger>. |
|
| 12 | A tower of flame bursts from the <container>! |
|
| 6–8 | You are jolted by a surge of electricity! |
|
| 3–5 | Suddenly you are frozen in place! |
|
| 0–2 | A cloud of <color> gas billows from the <container>. |
|
Strategy
Container traps can be very dangerous, especially if you lack poison resistance, fire resistance, and free action. It is a good idea to search each chest and box you find for traps. Since characters below level 21 are not guaranteed to find a trap even if one exists, you should check at least 2–3 times.
Luck has a strong effect on traps. If you have maximum Luck (13), 69% of traps will be harmless, compared to only 38% at 0 Luck. If your Luck is at least 8, only 0.6% of traps will be electricity traps.
Remember that once you find a trap, you can safely choose to leave it undisturbed. This might be a good idea in the early game, when your Luck is low and the consequences of setting off a trap are especially severe.
You can increase your chances of disarming a container trap by dragging the container to a shallower dungeon level. However, since trappable containers are heavy and the effect is small, this is probably not worth the effort.
Once you have reflection, an electricity trap is one of the few effects that can still destroy your rings and wands. If you are in an area with many chests, such as the Priest quest, Vlad's Tower or the Valley of the Dead, it might be a good idea to put them away temporarily.
Disarm a trapped container safely
To disarm a trapped container without risk of harm (other than taking damage), you need the following:
- Poison resistance, from a source other than the ring.
- Fire resistance, from a source other than the ring.
- Drop or stash all of the following:
- Spellbooks
- Potions
- Scrolls
- Wands
- Rings
- Take off all armor that is vulnerable to fire.
- One of the following:
- Be in a location where you cannot be disturbed for 30 turns, such as a closet.
- OR have free action and a unicorn horn.
References
- ↑ trap.c in NetHack 3.4.3, line 3500: Finding a trap on a container
- ↑ trap.c in NetHack 3.4.3, line 3511: Disarming a trap
- ↑ trap.c in NetHack 3.4.3, line 3617: Ineffective traps
- ↑ trap.c in NetHack 3.4.3, line 3638: Trap effects
- ↑ destroy_item in zap.c
This page may need to be updated for the current version of NetHack.
It may contain text specific to NetHack 3.4.3. Information on this page may be out of date.
Editors: After reviewing this page and making necessary edits, please change the {{nethack-343}} tag to the current version's tag or {{noversion}} as appropriate.
