Wearing a dwarvish cloak protects a worn helm from eroding, since the cloak is hooded.

Add a selfie-related hallucinatory YAFM for taking a picture of yourself with an expensive camera, like “#DungeonLife!” or “#HackerStyle!” Of course, you still get blinded.

New monster ‘chicken’, added to the c monster class, but it is a normal chicken with no special attributes or powers. Eating its corpse gives some chicken related YAFM, and wielding its corpse and hitting a monster with it may make them flee; a comment in the code should indicate that this is because they are “chickening out”.

A wielded aklys should not slip out of your hands if you have slippery fingers because it’s tethered to your arm.

You can wield a tooled horn to use it as an ear trumpet, temporarily alleviating deafness for as long as you keep it wielded.

The Tsurugi of Muramasa should act bloodthirsty like Stormbringer does, because historically all swords made by Muramasa were reputed to be bloodthirsty or traitorous.

Throwing holy water at demons should be buffed way over its current 2d6 damage, because it’s a fun interaction. Instead, it should severely weaken them, cancel them, stun them, and/or do a large amount of damage (perhaps 50% or some proportion of their max HP, possibly exempted for demon lords whose fights it would trivialize).

Add an anosmia status condition, in which you have no sense of smell:

• Tins cannot be identified by their smell, unless they contain spinach or are empty.
• Messages involving smell, such as when you cast stone to flesh on rocks, are suppressed.
• Food detection scrolls and the spell of detect food don’t work.
• Food appraisal doesn’t work.

Not specified what things in the game might cause this condition, or if it should be a roleplay birth option.

New material “demonite”, a metal which causes silver-like searing to A-class monsters, white unicorns, and some other “good” monsters.

Force-fighting with Cleaver makes it attack in an arc to the space you are hitting and the two adjacent spaces regardless of what’s in that space, allowing you to hit two monsters at the ends of the arc even if there is nothing between them.

Random tins can contain beans as their contents, which make you emit a stinking cloud when or after eating them.

The Heart of Ahriman should provide extrinsic protection like a ring of protection or one of the other quest artifacts that provides protection.

Apples (may) cure illness when eaten when blessed. However, their doctor-repelling power is increased to the point that Healers take damage when eating them or suffer some other negative effects, and hitting a Healer player monster with an apple scares them.

Add a spell of insight, a level 2 divination spell which grants enlightenment.

Artifact crossbow Thunderclap, which fires either lightning or lightning-enhances the crossbow bolts it fires, and you can invoke it to create more bolts.

There should be silver crossbow bolts so people who want to use a crossbow can still get silver damage.

You can tame (or at least pacify) hostile dwarves by throwing potions of booze at them, which they catch.

The type of shop that sells mainly scrolls should be called something other than “second-hand bookstore”, because scrolls are single use so second-hand scrolls don’t make sense.

Giant spiders currently just use the generic encyclopedia entry for all spiders. It should be replaced with a quote from The Hobbit or Lord of the Rings (or Harry Potter and the Chamber of Secrets) which involve actual giant spiders.

Artifact lock pick Doorbane, which mostly works like a regular one but prevents doors from resisting when it’s carried.

This functionality should also probability extend to the Master Key of Thievery.

Gelatinous ice cubes, which work mostly like gelatinous cubes but also have a cold attack.

Dart traps eventually shoot “big darts” instead of little darts, which do more damage than the little darts, although internally it’s still shooting a regular dart object.

Ammo shot from launchers (but not thrown ones) should receive a damage bonus based either on Dexterity or on the launcher’s enchantment to compensate for the Strength-based damage bonus for thrown missiles or melee weapons.

A greased bag of holding prevents corpses inside it from spoiling like an icebox will.

Wearing the “fencing gloves” type of gloves gives you a +1 to-hit bonus in melee combat.

If an aklys is tethered to your hand when wielded, you shouldn’t be able to drop it due to slippery fingers or fumbling.

If an invisible monster (or the player) is doused in a potion of see invisible from a thrown bottle breaking on them, they become visible again (unless extrinsically invisible which overrides this).

Elves sometimes carry lembas wafers, dwarves carry cram rations, and orcs carry tripe rations.

Add YAFMs:

• Combat messages produced when you attack a hallucinogen-distorted fog cloud are replaced by “You attack thick air.”
• When you try to engrave when engulfed by a dust vortex: “You try to write in the dust, but it won’t stand still!”
• When you get out of an air elemental (that you didn’t kill) while hallucinating: “I don’t think we’re in Kansas anymore.”
• When you attempt to move into a Mordor orc with the m prefix: “You fail to simply walk into the Mordor orc.”
• When a sasquatch is blinded by a camera flash: “Unfortunately, that picture’s probably going to come out blurry.”

Deathly illness should produce warning messages at various points as it ticks down towards fatality, similar to how most other timed instadeaths work. This would, among other benefits, allow players to set those messages as MSGTYPE=stop.

When you drop a wand of striking while levitating, it should “strike” the floor rather than the usual “hit” the floor.

When hallucinating, replace “You hear a chugging sound” with either “You hear a steam locomotive passing by” or “You hear someone chant ‘Chug, chug, chug!’”

Adjust NetHack’s monster speed system to accommodate the additional property that if your speed is greater than a monster’s, it is impossible for that monster to move 2 turns in a row before you get to act.

If you attack a peaceful monster in sight of your quest guardians and leader, they give you a warning rather than instantly becoming angered.

Elven daggers and arrows (and really any pointy wooden weapon) has a 5% chance of instakilling any vampire who is not wearing body armor.

Give potions more side dipping effects:

• Dipping an eroded item in a healing potion repairs erosion on it; 1 level for regular healing, 2 for extra healing, and 3 for full healing. Restore ability will repair all erosion as well.
• Dipping a negatively enchanted item in a restore ability potion reverts it to +0 if the potion is blessed, adds 1 point if uncursed, and does nothing if cursed.
• Dipping an enchantable item in a gain ability potion enchants it (by 1 point, always).
• Dipping an uncharged item (possibly excluding rings) into restore ability has the same effect as uncursed charging it. (Blessed charging cannot be reproduced this way, even if the potion is blessed).

If you ascend while polymorphed and your role is genocided, your god gives you some YAFM.

Alternatively (or additionally), the game is recorded as “ascended while on Charon’s boat”.

Chatting to trolls while hallucinating makes them appear to say internet-troll phrases: “Problem?” “U mad bro?” “Trololol!”