Potion of amnesia - Revision history

Umbire the Phantom: /* dNetHack */ lethe-rusted

2026-04-20T05:51:44Z

‎dNetHack: lethe-rusted

Umbire the Phantom: some citations and tweaks

2025-12-26T17:52:12Z

some citations and tweaks

Umbire the Phantom: start dnh section...

2025-10-13T04:22:20Z

start dnh section...

Umbire the Phantom: /* Description */ follow-up

2025-04-04T02:23:32Z

‎Description: follow-up

Ion frigate: remove redundant bit - this isn't strategy anyway

2025-04-03T11:51:22Z

remove redundant bit - this isn't strategy anyway

Ion frigate: helmet dipping, honestly one of the more annoying effects

2025-04-03T11:02:37Z

helmet dipping, honestly one of the more annoying effects

Ion frigate: try to be shorter about this, don't need to enumerate every example

2025-04-02T22:06:14Z

try to be shorter about this, don't need to enumerate every example

Ion frigate: want to reorganize this overall, but for now get down that this isn't the same thing as item upgrading

2025-04-02T22:03:09Z

want to reorganize this overall, but for now get down that this isn't the same thing as item upgrading

Ion frigate: trying to be good and avoid "unlucky"

2025-02-24T03:15:59Z

trying to be good and avoid "unlucky"

Ion frigate: actually useful more than one might think, e.g. if the minetown altar is cross-aligned and you're not strong enough to dive to D:15+ for the lawful quest altar

2025-02-24T03:13:42Z

actually useful more than one might think, e.g. if the minetown altar is cross-aligned and you're not strong enough to dive to D:15+ for the lawful quest altar

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 In dNetHack, notdNetHack and notnotdNetHack, the potion functions similarly, but has a few different effects on certain items:
-* [[Black signet ring]]s can be dipped into a potion of amnesia to apply a poison that causes amensia. Rings poisoned this way become '''lethe injecting''' and apply the poison when the hero performs an unarmed attack while wearing the ring without [[gloves]].
+* Certain weapons can be dipped into a potion of acid to apply an amnesia-inducing poison. Weapons "poisoned" this way become '''lethe-rusted''' and cause amnesia on each hit.
 ==Strategy==

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    |cost=100
 }}
 A '''potion of amnesia''' is a type of [[potion]] that appears in the [[Lethe patch]], [[SLASH'EM]], [[dNetHack]], [[notdNetHack]], [[SlashTHEM]], [[Hack'EM]], and [[notnotdNetHack]]. It always appears as a '''sparkling potion''' when [[Identification|unidentified]].
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 A monster that is not [[covetous]] or [[unique]] and is hit by a thrown potion of amnesia will be subject to a check versus [[Magic resistance (monster)|monster MR]]: if they do not resist, they have a {{frac|3|4}} chance of becoming peaceful, waking up if they were [[asleep]] at the time. The following additional effects and exceptions apply for certain monsters, including a hero in the form of one:
-* [[Flaming sphere]]s and [[iron golem]]s take up to six points of damage, as does a hero in the form of either monster.
+* [[Flaming sphere]]s and [[iron golem]]s take up to six points of damage, as does a hero in the form of either monster.{{refsrc|potion.c|1382|version=SLASH'EM 0.0.7E7F2}}{{refsrc|potion.c|1387|version=SLASH'EM 0.0.7E7F2}}{{refsrc|potion.c|1628|version=SLASH'EM 0.0.7E7F2}}{{refsrc|potion.c|1631|version=SLASH'EM 0.0.7E7F2}}
-* [[Gremlin]]s will [[divide]], including a hero in the form of one&mdash;a pet gremlin will untame, with no effects on hostility from the potion otherwise.
+* [[Gremlin]]s will [[divide]], including a hero in the form of one, and a pet gremlin will also untame (with no effects on hostility from the potion otherwise).{{refsrc|potion.c|1377|version=SLASH'EM 0.0.7E7F2}}
 * If a hero hits the [[Wizard of Yendor]] with the potion, it has no effect on him ''and'' causes him to inflict the amnesia upon the hero instead, which applies the effect of reading the blessed [[scroll of amnesia]].{{refsrc|potion.c|1401|version=SLASH'EM 0.0.7E7F2}}
 * While they are unaffected, certain unique monsters hit by the potion will print [[YAFM|unique messages]] if hit with the potion, [[#Messages|listed below]].

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 ==Description==
-{{todo|The following information concerns SLASH'EM. Work on including other variant information when possible, and split the article as necessary.}}
+{{todo|The following information concerns SLASH'EM. Work on including other variant information when possible, and section or split the article as deemed necessary.}}
 A [[hero]] [[quaffing]] a potion of amnesia [[abuse]]s [[wisdom]] and suffers [[amnesia]]: this removes memory of the current map with a {{frac|3}} chance of forgetting level maps, and has additional effects dependent on [[beatitude]]<!--verify, but code doesn't seem to bear this out: and an independent {{frac|3}} chance of forgetting item [[discoveries]] and [[identification]]-->&mdash; a blessed potion cures [[lycanthropy]] and [[sickness]] while granting 51-100 [[nutrition]], while a non-blessed potion has a {{frac|3}} chance of causing the hero to forget [[Spellcasting|learned spells]].
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 Being physically hit with the potion also has a {{frac|9|10}} chance of subjecting the victim's worn helm to its effects, or {{frac|2}} if the helm is cursed. Monsters will throw this potion, and hostile ones will toss it at the hero.
 ==Strategy==

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 While many of these downgrades are also possible via [[upgrading objects]], the effects are mechanically distinct and do not entirely overlap (e.g. one cannot "upgrade" a magic lamp to an oil lamp, or vice versa).
-A [[thrown]] potion of amnesia that hits the hero causes them to forget some maps, object identities and spells, which also occurs if they are subjected to its [[vapors]]. Additionally, their helmet has a 90% chance of being subjected to the effects of dipping; this is reduced to 50% if the helmet is cursed.{{refsrc|potion.c|1218|version=SLASH'EM 0.0.7E7F2}}
+A [[thrown]] potion of amnesia that hits the hero causes them to forget some maps, object identities and spells, which also occurs if they are subjected to its [[vapors]]. Additionally, their [[worn] [[helm]] has a {{frac|9|10}} chance (90%) of being subjected to the effects of dipping; this chance is reduced to {{frac|2}} (50%) if the helmet is cursed.{{refsrc|potion.c|1218|version=SLASH'EM 0.0.7E7F2}}
-A monster hit by the thrown potion that is not [[covetous]] or [[unique]] hits a monster is subject to a check versus [[Magic resistance (monster)|monster MR]], and if they do not resist they have a {{frac|3|4}} chance of becoming peaceful, waking up if they were [[asleep]] at the time. The following additional effects and exceptions apply for certain monsters, including a hero in the form of one:
+A monster that is not [[covetous]] or [[unique]] and is hit by a thrown potion of amnesia will be subject to a check versus [[Magic resistance (monster)|monster MR]]: if they do not resist, they have a {{frac|3|4}} chance of becoming peaceful, waking up if they were [[asleep]] at the time. The following additional effects and exceptions apply for certain monsters, including a hero in the form of one:
 * [[Flaming sphere]]s and [[iron golem]]s take up to six points of damage, as does a hero in the form of either monster.
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 * While they are unaffected, certain unique monsters hit by the potion will print [[YAFM|unique messages]] if hit with the potion, [[#Messages|listed below]].
-Being physically hit with the potion also has a {{frac|9|10}} chance of subjecting the victim's [[worn]] [[helm]] to its effects, or {{frac|2}} if the helm is cursed. Monsters will throw this potion, and hostile ones will toss it at the hero.
+Being physically hit with the potion also has a {{frac|9|10}} chance of subjecting the victim's worn helm to its effects, or {{frac|2}} if the helm is cursed. Monsters will throw this potion, and hostile ones will toss it at the hero.
 ==Strategy==

← Older revision		Revision as of 11:51, 3 April 2025
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	This potion can also be used to pacify angry shopkeepers "''Shopkeeper'' looks at you curiously!". In some circumstances, this can also erase any debt you have. Specifically, when you escape a store with unpaid items or debt, the shopkeeper is considered "robbed", your ordinary shopping debt is erased, any stolen items become yours, and in order to pacify the shopkeeper, you would normally need to give them at least half the amount for which they were robbed, i.e. half the total of your debt and the value of the stolen items.<ref>[[Source:SLASH'EM_0.0.7E7F2/shk.c\|shk.c]] and [[Source:SLASH'EM_0.0.7E7F2/potion.c\|potion.c]], in particular the functions do_pay and make_happy_shk</ref> Hitting a shopkeeper with a potion of amnesia causes shopkeepers to forget about being robbed - no matter how much they were robbed for - but does not cause them to forget ordinary shopping debt or unpaid items.		This potion can also be used to pacify angry shopkeepers "''Shopkeeper'' looks at you curiously!". In some circumstances, this can also erase any debt you have. Specifically, when you escape a store with unpaid items or debt, the shopkeeper is considered "robbed", your ordinary shopping debt is erased, any stolen items become yours, and in order to pacify the shopkeeper, you would normally need to give them at least half the amount for which they were robbed, i.e. half the total of your debt and the value of the stolen items.<ref>[[Source:SLASH'EM_0.0.7E7F2/shk.c\|shk.c]] and [[Source:SLASH'EM_0.0.7E7F2/potion.c\|potion.c]], in particular the functions do_pay and make_happy_shk</ref> Hitting a shopkeeper with a potion of amnesia causes shopkeepers to forget about being robbed - no matter how much they were robbed for - but does not cause them to forget ordinary shopping debt or unpaid items.
−
−	Being hit with the potion has a 90% chance of causing your helmet to be subjected to the effects of the potion (50% chance if the helmet is cursed, as a cursed helmet would benefit from the potion). You will also be subjected to the vapors of the potion, causing you to forget items and spells.

	==Messages==		==Messages==

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 |}
-While many of these downgrades are also possible via [[upgrading objects]], the effects are mechanically distinct.  There are also a few notable differences from item upgrades:
+While many of these downgrades are also possible via [[upgrading objects]], the effects are mechanically distinct and do not entirely overlap (e.g. one cannot "upgrade" a magic lamp to an oil lamp, or vice versa).
 A [[thrown]] potion of amnesia that hits the hero causes them to forget some maps, object identities and spells, which also occurs if they are subjected to its [[vapors]]. A monster hit by the thrown potion that is not [[covetous]] or [[unique]] hits a monster is subject to a check versus [[Magic resistance (monster)|monster MR]], and if they do not resist they have a {{frac|3|4}} chance of becoming peaceful, waking up if they were [[asleep]] at the time. The following additional effects and exceptions apply for certain monsters, including a hero in the form of one:

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 [[Dipping]] the potion or a stack of potions into an uncursed [[potion of water]] or body of [[deep water]] will immediately turn it into a potion of water of the same beatitude. The moat squares around the [[Castle]] act as [[Lethe water]], which behaves very similarly to the potion, and dipping a potion of water into those moats will turn it into a potion of amnesia. [[Canceling]] a potion of amnesia will only set its beatitude to uncursed.
-Dipping an item or stack of items into the potion has a number of effects: the item or item stack has its beatitude set to uncursed, positively-enchanted items may lose a point of [[enchantment]], [[rust]]prone items have a {{frac|2}} chance of rusting, erosion-proof objects have a {{frac|13}} chance of losing their erosion-proof status, and [[magic marker]]s lose 3-12 charges. Some [[magical item]]s are also [[downgraded]] to non-magical counterparts:
+Dipping an item or stack of items into the potion has a number of effects: the item or item stack has its beatitude set to uncursed, positively-enchanted items may lose a point of [[enchantment]], [[rust]]prone items have a {{frac|2}} chance of rusting, erosion-proof objects have a {{frac|13}} chance of losing their erosion-proof status, and [[magic marker]]s lose 3-12 charges. Some [[magical item]]s are also downgraded to non-magical counterparts{{refsrc|potion.c|1934|version=SLASH'EM 0.0.7E7F2}}:
 {|class="prettytable striped"
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 |[[horn of plenty]]
 |}
 A [[thrown]] potion of amnesia that hits the hero causes them to forget some maps, object identities and spells, which also occurs if they are subjected to its [[vapors]]. A monster hit by the thrown potion that is not [[covetous]] or [[unique]] hits a monster is subject to a check versus [[Magic resistance (monster)|monster MR]], and if they do not resist they have a {{frac|3|4}} chance of becoming peaceful, waking up if they were [[asleep]] at the time. The following additional effects and exceptions apply for certain monsters, including a hero in the form of one:

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 ==Strategy==
-The potion of amnesia can be used to uncurse or unbless items, but as they can result in losing enchantment, charges, and rusting, this is usually suboptimal. Drinking the potion is usually bad, and as the appearance is not randomized it is trivial to avoid. Drinking a blessed potion can be used to cure [[lycanthropy]] or [[sickness]] if no other alternatives are available. The potion also gives a surprising amount of nutrition when blessed, which may be of use for a [[foodless]] ascension.  Additionally, [[atheist]] (or simply unlucky) heroes can create [[holy water]] or [[unholy water]] by diluting blessed or cursed potions of amnesia.
+The potion of amnesia can be used to uncurse or unbless items, but as they can result in losing enchantment, charges, and rusting, this is usually suboptimal. Drinking the potion is usually bad, and as the appearance is not randomized it is trivial to avoid. Drinking a blessed potion can be used to cure [[lycanthropy]] or [[sickness]] if no other alternatives are available. The potion also gives a surprising amount of nutrition when blessed, which may be of use for a [[foodless]] ascension.  Additionally, [[atheist]] (or simply unfortunate) heroes can create [[holy water]] or [[unholy water]] by diluting blessed or cursed potions of amnesia.
 Monsters will throw this potion at you, causing amnesia, so it is advisable to pick up any that you find, even if you do not intend to use them.  If you plan on breaking the potion by throwing it, make sure there is an empty square between you and the wall you throw it at.  Generally it is better to keep it to dilute, but if you don't have a sack or a handy fountain, destroying it may be preferable, since you will be subjected to the vapors if the potion is destroyed by a fire attack.