Helm of telepathy - Revision history

Umbire the Phantom: /* dNetHack */ detail

2026-07-12T22:20:04Z

‎dNetHack: detail

Umbire the Phantom: /* dNetHack */ that was a quick enough calc

2026-07-12T20:48:59Z

‎dNetHack: that was a quick enough calc

Umbire the Phantom: dnh

2026-07-12T20:11:26Z

dnh

Umbire the Phantom: mostly variants now

2026-07-12T19:33:55Z

mostly variants now

Umbire the Phantom: /* Description */ comment up refsrc, detail

2026-07-12T18:20:04Z

‎Description: comment up refsrc, detail

Umbire the Phantom: start on nh5 stuff

2026-07-12T17:03:06Z

start on nh5 stuff

Umbire the Phantom: pothole

2026-07-09T12:18:16Z

pothole

Umbire the Phantom: some touch-ups

2026-07-09T11:32:52Z

some touch-ups

Umbire the Phantom: *dnh

2026-07-06T12:45:43Z

*dnh

Umbire the Phantom: /* dNetHack */ detail

2025-06-30T13:44:46Z

‎dNetHack: detail

@@ Line 57: / Line 57: @@
 In [[dNetHack]], the helm of telepathy grants 1 base AC, 1 base [[DR]] and extrinsic telepathy while worn, and its weight is reduced to 30 aum. If randomized to a [[Band (helm)|band]], it will appear as a "'''tiara of telepathy'''".
-[[Player monster (dNetHack)|Player monsters]] generated on the Astral Plane have an effective {{frac|7|96}} chance of being generated with a helm of telepathy as their initial helm. [[Healer (dNetHack monster)|Healers]], [[Priest (dNetHack monster)|priests and priestesses]], as well as [[itinerant priestess]]es, have a {{frac|3|8}} chance of generating with a helm of telepathy that replaces their initially-selected helm during inventory creation.
+[[Player monster (dNetHack)|Player monsters]] generated on the Astral Plane have an effective {{frac|7|96}} chance of being generated with a helm of telepathy as their initial helm  before role-based replacements. [[Healer (dNetHack monster)|Healers]], [[Priest (dNetHack monster)|priests and priestesses]], as well as [[itinerant priestess]]es, have a {{frac|3|8}} chance of generating with a helm of telepathy that replaces their initially-selected helm during inventory creation.
 A helm of telepathy can be used to repair the extrasensory perception subsystem of an [[imperial elven helm]], granting the extrinsic telepathy property while the helm is worn.

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 In [[dNetHack]], the helm of telepathy grants 1 base AC, 1 base [[DR]] and extrinsic telepathy while worn, and its weight is reduced to 30 aum. If randomized to a [[Band (helm)|band]], it will appear as a "'''tiara of telepathy'''".
-[[Player monster (dNetHack)|Player monster]] [[Healer (dNetHack monster)|healers]], [[Priest (dNetHack monster)|priests and priestesses]] as well as [[itinerant priestess]]es have a {{frac|3|8}} chance of generating with a helm of telepathy that replaces their initially-selected helm.
+[[Player monster (dNetHack)|Player monsters]] generated on the Astral Plane have an effective {{frac|7|96}} chance of being generated with a helm of telepathy as their initial helm. [[Healer (dNetHack monster)|Healers]], [[Priest (dNetHack monster)|priests and priestesses]], as well as [[itinerant priestess]]es, have a {{frac|3|8}} chance of generating with a helm of telepathy that replaces their initially-selected helm during inventory creation.
 A helm of telepathy can be used to repair the extrasensory perception subsystem of an [[imperial elven helm]], granting the extrinsic telepathy property while the helm is worn.

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 ===dNetHack===
-In [[dNetHack]], the helm of telepathy grants 1 AC, 1 [[DR]] and telepathy while worn, and its weight is reduced to 30 aum. If randomized to a [[Band (helm)|band]], it will appear as a "'''tiara of telepathy'''".
+In [[dNetHack]], the helm of telepathy grants 1 base AC, 1 base [[DR]] and extrinsic telepathy while worn, and its weight is reduced to 30 aum. If randomized to a [[Band (helm)|band]], it will appear as a "'''tiara of telepathy'''".
 [[dNetHack artifacts#The All-seeing Eye of the Fly|The All-seeing Eye of the Fly]] is an [[intelligent artifact]] that [[Baalzebub (dNetHack)|Baalzebub]] will always generate with, and is a lawful, [[Item size (dNetHack)|large-sized]] and [[golden]] helm of telepathy. A hero wearing it gains passive [[monster detection]] as well as telepathy, and using far look on monsters will show their [[DR]] breakdown as well as their current inventory. [[Invoking]] the artifact lets the hero cast a targeted area-of-effect "death spell" on a square or monster that they can see, which is flavored as a "disintegration field" and acts similarly to the effect of breaking a charged [[wand of death]].

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 The helm of telepathy makes up {{frac|250}} (0.4%) of all armor that is randomly generated on the ground, in general [[shop]]s or as [[death drop]]s. Used armor dealerships and antique weapon outlets can also stock helms of telepathy.
-[[Player monster]]s, including those on the [[Astral Plane]], have a {{sfrac|7|132}} chance (~5.3%) of generating with a helm of telepathy as their initial helm before role-based replacements, with cases that can affect this initial helm selection listed below:{{refsrc|src/mplayer.c|154|nethack=5.0.0|comment=Default equipment; the helm is chosen from within the designated object classes inclusively in objects.h}}{{refsrc|src/mplayer.c|283|nethack=5.0.0|comment=Helms are only generated for Astral Plane playermons}}
+[[Player monster]]s, including those on the [[Astral Plane]], have a {{sfrac|7|132}} chance (~5.3%) of being [[generated with]] a helm of telepathy as their initial helm before role-based replacements, with cases that can affect this initial helm selection listed below:{{refsrc|src/mplayer.c|154|nethack=5.0.0|comment=Default equipment; the helm is chosen from within the designated object classes inclusively in objects.h}}{{refsrc|src/mplayer.c|283|nethack=5.0.0|comment=Helms are only generated for Astral Plane playermons}}
 * Player monster [[Healer (player monster)|healers]] and [[Cleric (player monster)|clerics]] have a {{frac|3|8}} chance of their initial helm being replaced with a helm of telepathy, raising their effective odds of retaining the helm of telepathy to {{sfrac|431|1056}} (~40.81%).{{refsrc|src/mplayer.c|187|nethack=5.0.0|comment=Helm replacement for healers}}{{refsrc|src/mplayer.c|212|nethack=5.0.0|comment=Helm replacement for clerics}}
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 ==Description==
-While worn, the helm of telepathy grants 1 base [[AC]] and the extrinsic [[telepathy]] property, with the range of the hero's current extrinsic telepathy being increased by the amount of sources that the hero has applied{{refsrc|src/worn.c|48-L69|nethack=5.0.0|comment=<tt>recalc_telepat_range()</tt> function}}{{refsrc|src/worn.c|144|nethack=5.0.0|comment=check extrinsic telepathy range when source of telepathy is worn or becomes active}}{{refsrc|src/worn.c|183|nethack=5.0.0|comment=check extrinsic telepathy range when source of telepathy is taken off or becomes inactive}}&mdash;all [[artifact]]s that grant telepathy by any means other than their [[base item]] count as a single source for this purpose, regardless of how many the hero is carrying.{{refsrc|src/artifact.c|798-L805|nethack=5.0.0|comment=telepathy from artifacts is consolidated as a single source}} As a metallic helm, it raises the hero's [[spellcasting]] failure rates while worn and protects its wearer from most falling objects.
+While worn, the helm of telepathy grants 1 base [[AC]] and the extrinsic [[telepathy]] property, with the range of the hero's current extrinsic telepathy being increased by the amount of sources that the hero has applied{{refsrc|src/worn.c|48-L69|nethack=5.0.0|comment=<tt>recalc_telepat_range()</tt> function}}{{refsrc|src/worn.c|144|nethack=5.0.0|comment=check extrinsic telepathy range when source of telepathy is worn or becomes active}}{{refsrc|src/worn.c|183|nethack=5.0.0|comment=check extrinsic telepathy range when source of telepathy is taken off or becomes inactive}}&mdash;all [[artifact]]s that grant telepathy by any means other than their [[base item]] count as a single source for this purpose, regardless of how many the hero is carrying.{{refsrc|src/artifact.c|798-L805|nethack=5.0.0|comment=telepathy from artifacts is consolidated as a single source}}
 ==Strategy==
@@ Line 40: / Line 42: @@
 ==Variants==
 ===SLASH'EM===
-In [[SLASH'EM]], [[upgrading]] a helm of telepathy will produce a [[dwarvish iron helm]], and upgrading a dwarvish iron helm has a {{frac|2}} chance of producing a helm of telepathy.
+In [[SLASH'EM]], [[upgrading]] a helm of telepathy will produce a [[dwarvish iron helm]], and upgrading a dwarvish iron helm has a {{frac|2}} chance of producing a helm of telepathy.{{refsrc|potion.c|2342|version=SLASH'EM 0.0.7E7F2}}{{refsrc|potion.c|2345|version=SLASH'EM 0.0.7E7F2}}
-[[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 [[Naming artifacts|attempting to name a magical helm]] "The Crown of Saint Edward" and seeing if it succeeds.
+[[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]] while carried. It is possible to informally identify a helm of telepathy by [[Naming artifacts|attempting to name a magical helm]] "The Crown of Saint Edward" and seeing if it succeeds.
-[[Grund's Stronghold]] has a {{frac|3}} chance of a blessed helm of telepathy generating within a [[chest]] in a hidden portion of the level's southwest corner.
+[[Grund's Stronghold]] has a {{frac|3}} chance of a blessed helm of telepathy generating within a [[chest]] in a hidden portion of the level's southwest corner during level creation.
 ===SporkHack===
-In [[SporkHack]], it is possible for the helm of telepathy to have the randomized appearance of a "tinfoil hat", which blocks telepathy and psionic abilities from both the wearer and any hostile monsters targeting the wearer (e.g. [[mind blast]]s)&mdash;thus a helm of telepathy that appears as a "tinfoil hat" always blocks its own telepathy.
+In [[SporkHack]], it is possible for the helm of telepathy to have the [[Helm#SporkHack|randomized appearance]] of a "tinfoil hat", which blocks telepathy and psionic abilities from both the wearer and any hostile monsters targeting the wearer (e.g. [[mind blast]]s)&mdash;thus a helm of telepathy that appears as a "tinfoil hat" always blocks its own telepathy.
 ===dNetHack===
 In [[dNetHack]], the helm of telepathy grants 1 AC, 1 [[DR]] and telepathy while worn, and its weight is reduced to 30 aum. If randomized to a [[Band (helm)|band]], it will appear as a "'''tiara of telepathy'''".
-[[dNetHack artifacts#The All-seeing Eye of the Fly|The All-seeing Eye of the Fly]] is a lawful large-sized [[intelligent artifact]] helm of telepathy that [[Baalzebub (dNetHack)|Baalzebub]] will always generate with. A hero wearing it gains passive [[monster detection]] as well as telepathy, and using far look on monsters will show their [[DR]] breakdown as well as their current inventory. [[Invoking]] the artifact lets the hero cast a targeted area-of-effect "death spell" on a square or monster that they can see, which is flavored as a disintegration field and acts similarly to the effect of breaking a charged [[wand of death]].
+[[dNetHack artifacts#The All-seeing Eye of the Fly|The All-seeing Eye of the Fly]] is an [[intelligent artifact]] that [[Baalzebub (dNetHack)|Baalzebub]] will always generate with, and is a lawful, [[Item size (dNetHack)|large-sized]] and [[golden]] helm of telepathy. A hero wearing it gains passive [[monster detection]] as well as telepathy, and using far look on monsters will show their [[DR]] breakdown as well as their current inventory. [[Invoking]] the artifact lets the hero cast a targeted area-of-effect "death spell" on a square or monster that they can see, which is flavored as a "disintegration field" and acts similarly to the effect of breaking a charged [[wand of death]].
 ===SpliceHack===
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 ===notdNetHack===
-In [[notdNetHack]] and [[notnotdNetHack]], in addition to dNetHack details, [[Dantalion]] is generated with a helm of telepathy when summoned by an [[Illithanachronounbinder]].
+In [[notdNetHack]] and [[notnotdNetHack]], in addition to dNetHack details, [[Dantalion]] is always generated with a helm of telepathy when summoned by an [[Illithanachronounbinder]].
 ===EvilHack===
-In [[EvilHack]], the telepathy [[object property]] cannot generate on helms due to the helm of telepathy existing.
+In [[EvilHack]], the "telepathy" [[object property]] cannot generate on helms of any kind due to the helm of telepathy existing.
 [[Illithid (starting race)|Illithid]] characters that use their [[psionic wave]] ability while wearing a [[mithril]] or non-[[metallic]] helm of telepathy have a {{frac|4}} chance of the helm focusing the attack and increasing its damage by d6+2.
@@ Line 69: / Line 73: @@
 In [[Hack'EM]], upgrading a [[Tinfoil hat (Hack'EM)|tinfoil hat]] will produce a helm of telepathy and vice versa.
-The Crown of Saint Edward is an artifact helm of telepathy as in SLASH'EM, and made of [[steel]] so that it can be safely worn by [[Elf (starting race)|elven]] Yeomen.
+The Crown of Saint Edward is an artifact helm of telepathy as in SLASH'EM, and is made of [[steel]] so that it can be safely worn by [[Elf (starting race)|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.
+Grund's Stronghold retains the {{frac|3}} chance of generating a blessed helm of telepathy in the chest within the hidden area in the southwest.
 ==References==

@@ Line 22: / Line 22: @@
 ==Description==
-While worn, the helm of telepathy grants 1 base [[AC]] and the extrinsic [[telepathy]] property, with the range of the hero's current extrinsic telepathy being increased by the amount of sources that the hero has applied{{refsrc|src/worn.c|48-L69|nethack=5.0.0}}{{refsrc|src/worn.c|144|nethack=5.0.0}}{{refsrc|src/worn.c|183|nethack=5.0.0}}&mdash;all [[artifact]]s that grant telepathy by any means other than their [[base item]] count as a single source.{{refsrc|src/artifact.c|798-L805|nethack=5.0.0}} As a metallic helm, it raises the hero's [[spellcasting]] failure rates while worn and protects its wearer from most falling objects.
+While worn, the helm of telepathy grants 1 base [[AC]] and the extrinsic [[telepathy]] property, with the range of the hero's current extrinsic telepathy being increased by the amount of sources that the hero has applied{{refsrc|src/worn.c|48-L69|nethack=5.0.0|comment=<tt>recalc_telepat_range()</tt> function}}{{refsrc|src/worn.c|144|nethack=5.0.0|comment=check extrinsic telepathy range when source of telepathy is worn or becomes active}}{{refsrc|src/worn.c|183|nethack=5.0.0|comment=check extrinsic telepathy range when source of telepathy is taken off or becomes inactive}}&mdash;all [[artifact]]s that grant telepathy by any means other than their [[base item]] count as a single source for this purpose, regardless of how many the hero is carrying.{{refsrc|src/artifact.c|798-L805|nethack=5.0.0|comment=telepathy from artifacts is consolidated as a single source}} As a metallic helm, it raises the hero's [[spellcasting]] failure rates while worn and protects its wearer from most falling objects.
 ==Strategy==

@@ Line 11: / Line 11: @@
    |material=iron
 }}
-A '''helm of telepathy''' is a type of [[magical item|magical]] [[helm]] that appears in ''[[NetHack]]''. It is made of [[iron]] and has a [[randomized appearance]] when [[unidentified]]; the default one associated with it is a [[visored helmet]].{{refsrc|src/objects.c|470|version=NetHack 3.6.7}}
+A '''helm of telepathy''' is a type of [[helm]] that appears in ''[[NetHack]]''. It is a [[Magical item|magical]] helm that is made of [[iron]] and has a [[randomized appearance]] when [[unidentified]]{{refsrc|src/o_init.c|280-L281|nethack=5.0.0}}{{refsrc|src/o_init.c|331|nethack=5.0.0}}&mdash;the default one associated with it is a "visored helmet".{{refsrc|include/objects.h|476|nethack=5.0.0}}
 ==Generation==
-In addition to random generation, general [[shop]]s and used used armor dealerships can sell helms of telepathy.
+The helm of telepathy makes up {{frac|250}} (0.4%) of all armor that is randomly generated on the ground, in general [[shop]]s or as [[death drop]]s. Used armor dealerships and antique weapon outlets can also stock helms of telepathy.
-[[Player monster]]s, including those on the [[Astral Plane]], have a {{frac|7|200}} chance (3.5%) of generating with a helm of telepathy as their initial helm before role-based replacements{{refsrc|src/mplayer.c|159|version=NetHack 3.6.7|comment=Default equipment; the helm is chosen from within the designated object classes inclusively in objects.c}} - [[Healer (player monster)|healers]] and [[Priest (player monster)|priests]] each have a {{frac|3|8}} chance of their initial helm being replaced with a helm of telepathy, raising their effective odds of generating with one to ~39.69%.{{refsrc|src/mplayer.c|193|version=NetHack 3.6.7|comment=Helm replacement for healers}}{{refsrc|src/mplayer.c|219|version=NetHack 3.6.7|comment=Helm replacement for priests}}
+[[Player monster]]s, including those on the [[Astral Plane]], have a {{sfrac|7|132}} chance (~5.3%) of generating with a helm of telepathy as their initial helm before role-based replacements, with cases that can affect this initial helm selection listed below:{{refsrc|src/mplayer.c|154|nethack=5.0.0|comment=Default equipment; the helm is chosen from within the designated object classes inclusively in objects.h}}{{refsrc|src/mplayer.c|283|nethack=5.0.0|comment=Helms are only generated for Astral Plane playermons}}
 ==Description==
-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.
+While worn, the helm of telepathy grants 1 base [[AC]] and the extrinsic [[telepathy]] property, with the range of the hero's current extrinsic telepathy being increased by the amount of sources that the hero has applied{{refsrc|src/worn.c|48-L69|nethack=5.0.0}}{{refsrc|src/worn.c|144|nethack=5.0.0}}{{refsrc|src/worn.c|183|nethack=5.0.0}}&mdash;all [[artifact]]s that grant telepathy by any means other than their [[base item]] count as a single source.{{refsrc|src/artifact.c|798-L805|nethack=5.0.0}} As a metallic helm, it raises the hero's [[spellcasting]] failure rates while worn and protects its wearer from most falling objects.
 ==Strategy==
-{{main|Telepathy}}
+{{main|Telepathy#Strategy|l1=Telepathy strategy}}
-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 artifact]]s such as [[The Platinum Yendorian Express Card]] or [[The Eye of the Aethiopica]].
+{{recent|NetHack 5.0.0|Make adjustments for changes to extrinsic telepathy.}}
 A non-[[chaotic]] character may consider wearing this helm in some unusual cases where they intend to [[murder]] peaceful [[Human (monster attribute)|humans]] such as [[shopkeeper]]s or [[priest]]s, depending on how much easier it is for them to recover [[Luck]] and [[alignment record]] than intrinsic telepathy.
 ===Identification===
 The helm of telepathy has the same base price of 50[[zm]] 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 look]]ing 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 properties allow the hero to see them.
+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 look]]ing 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 properties allow the hero to see them&mdash;blinding yourself will also display all monsters on the level that are not mindless, as with intrinsic telepathy.
 ==History==
-The helm of telepathy first appears in [[NetHack 3.0.0]].
+The helm of telepathy first appears in [[NetHack 3.0.0]]. From this version to [[NetHack 3.6.7]], including variants based on those versions, extrinsic telepathy functions the same regardless of the amount of sources that the hero possesses&mdash;[[NetHack 5.0.0]] adds the ability to enhance extrinsic telepathy with multiple sources via {{commit|28ed8e79622ec6596eb59d642788a7f8375e78c8}} and {{commit|969c87c0a169d87295fe2b4e914acfae84e01057}}.
 ==Variants==
@@ Line 73: / Line 75: @@
 ==References==
 <references/>
-{{nethack-367}}
+{{nethack-500}}
 [[Category:Helms]]

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 ===Hack'EM===
-In [[Hack'EM]], upgrading a [[Tinfoil hat (SpliceHack)|tinfoil hat]] will produce a helm of telepathy and vice versa.
+In [[Hack'EM]], upgrading a [[Tinfoil hat (Hack'EM)|tinfoil hat]] will produce a helm of telepathy and vice versa.
 The Crown of Saint Edward is an artifact helm of telepathy as in SLASH'EM, and made of [[steel]] so that it can be safely worn by [[Elf (starting race)|elven]] Yeomen.

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 In [[dNetHack]], the helm of telepathy grants 1 AC, 1 [[DR]] and telepathy while worn, and its weight is reduced to 30 aum. It can appear in [[Band (dNetHack)|band]] form as a "tiara of telepathy".
-[[dNetHack artifacts#The All-seeing Eye of the Fly|The All-seeing Eye of the Fly]] is a lawful large-sized [[intelligent artifact]] helm of telepathy that [[Baalzebub (dNetHack)|Baalzebub]] will always generate with. A hero wearing it gains passive monster detection, and using far look on monsters will show their [[DR]] breakdown as well as their current inventory. [[Invoking]] the artifact lets the hero cast an area-of-effect "death spell", which is flavored as a disintegration field and acts similarly to the effect of breaking a charged [[wand of death]].
+[[dNetHack artifacts#The All-seeing Eye of the Fly|The All-seeing Eye of the Fly]] is a lawful large-sized [[intelligent artifact]] helm of telepathy that [[Baalzebub (dNetHack)|Baalzebub]] will always generate with. A hero wearing it gains passive [[monster detection]] as well as telepathy, and using far look on monsters will show their [[DR]] breakdown as well as their current inventory. [[Invoking]] the artifact lets the hero cast a targeted area-of-effect "death spell" on a square or monster that they can see, which is flavored as a disintegration field and acts similarly to the effect of breaking a charged [[wand of death]].
 ===SpliceHack===