Helm of telepathy

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[ Plumed helmet.png[ Etched helmet.png[ Crested helmet.png[ Visored helmet.png
helm of telepathy
Appearance random
Slot helm
AC 1
Base price 50 zm
Weight 50
Material iron

A helm of telepathy is a type of magical helm that appears in NetHack. It is made of iron and has a randomized appearance; the default one associated with it is a visored helmet.[1]


In addition to random generation, general shops and used used armor dealerships can sell helms of telepathy.

Player monsters, including those on the Astral Plane, have a 7200 chance (3.5%) of generating with a helm of telepathy as their initial helm before role-based replacements[2] - healers and priests each have a 38 chance of their initial helm being replaced with a helm of telepathy, raising their effective odds of generating with one to ~39.69%.[3][4]


While worn, the helm grants 1 base AC and extrinsic telepathy. Though it is a mind-enhancing helm, it has the same adverse effects on spellcasting as most other metal helms.


Main article: Telepathy

Extrinsic telepathy is a useful property for an ascension kit, though not an essential enough one to warrant a wish - the helm of telepathy is usually superseded for this purpose by quest artifacts such as The Platinum Yendorian Express Card or The Eye of the Aethiopica.

A non-chaotic character may consider wearing this helm in some unusual cases where they intend to murder peaceful humans such as shopkeepers or priests, depending on how much easier it is for them to recover Luck and alignment record than intrinsic telepathy.

The following information pertains to an upcoming version (3.7.0). If this version is now released, please verify that it is still accurate, then update the page to incorporate this information.

Per commit 28ed8e79, the range of extrinsic telepathy is 8*sqrt{n}, where n is the number of sources - per commit 969c87c0, sources of telepathy conferred by an artifact's non-base item properties are counted as one source.


The helm of telepathy has the same base price of 50zm and base weight of 50 aum as the other two randomized magical helms, the helm of brilliance and the helm of opposite alignment.

While wearing the helm but does not auto-identify it, its effect may become obvious after a short while if you are not blind, and you can confirm if a freshly-worn helm is telepathy by far looking the next monster that becomes visible to you. If it is not mindless, and you have no other source of extrinsic telepathy such as an amulet of ESP, then your helm is a helm of telepathy. Long durations of intrinsic monster detection may interfere with this, though using far look on monsters will still make clear what methods they are being seen through.


The helm of telepathy first appears in NetHack 3.0.0.



In SLASH'EM, upgrading a dwarvish iron helm has a 12 chance of producing a helm of telepathy, and upgrading a helm of telepathy will produce a dwarvish iron helm.

The Crown of Saint Edward is an artifact helm of telepathy that serves as the Yeoman quest artifact, and also provides magic resistance and half spell damage. It is possible to informally identify a helm of telepathy by attempting to name a magical helm "The Crown of Saint Edward" and seeing if it succeeds.

Grund's Stronghold has a 13 chance of a blessed helm of telepathy generating in a chest within a hidden area in the level's southwest corner.


In SporkHack, it is possible for the helm of telepathy to have the randomized appearance of a tin foil hat - tin foil hats protect you from the psychic blasts employed by mind flayers, but also block your own sources of telepathy, including the helm's telepathy should this occur.


In dNetHack, the helm of telepathy grants 1 AC, 1 DR and telepathy while worn; its weight is reduced to 30 aum, and it can also appear in band form, which is known as a tiara of telepathy.

The All-seeing Eye of the Fly is a lawful large-sized intelligent artifact helm of telepathy that Baalzebub will always generate with. While worn by a character, it grants passive monster detection, and using far look on monsters will show their DR breakdown as well as their current inventory. Invoking the artifact lets you cast an area-of-effect "death spell", which is flavored as a disintegration field and acts similarly to the effect of breaking a wand of death.


In SpliceHack, a helm of telepathy can be created at a furnace by combining a plain helmet and an amulet of ESP.


In notdNetHack, in addition to dNetHack details, Dantalion is generated with a helm of telepathy when summoned by an Illithanachronounbinder.


In EvilHack, the telepathy object property cannot generate on helms due to the helm of telepathy existing.

Illithid characters that use their psionic wave ability while wearing a mithril or non-metallic helm of telepathy have a 14 chance of the helm focusing the attack and increasing its damage by d6+2.


In Hack'EM, upgrading a tinfoil hat will produce a helm of telepathy and vice versa.

The Crown of Saint Edward is made of steel so that it can safely be worn by elven Yeomen.

Grund's Stronghold retains the chance of generating a blessed helm of telepathy in the chest within the hidden area in the southwest.


  1. src/objects.c in NetHack 3.6.7, line 470
  2. src/mplayer.c in NetHack 3.6.7, line 159: Default equipment; the helm is chosen from within the designated object classes inclusively in objects.c
  3. src/mplayer.c in NetHack 3.6.7, line 193: Helm replacement for healers
  4. src/mplayer.c in NetHack 3.6.7, line 219: Helm replacement for priests