Blowing a tin whistle makes any watchmen on the level converge on you. They won’t be angered, but may be slightly miffed about the false alarm and/or get angered if you keep abusing it.
Chromatic dragon scales or scale mail, rather than providing all resistances at once, can be invoked to choose which one resistance it will provide. This resistance remains active until the next time you invoke it.
Delicatessens buy and sell tin openers, though they may not actually generate with any (it would internally appear on the list of the shop’s wares, but with 0 frequency).
Also, the canned food factory shop type in UnNetHack should buy and sell these.
Improvising on a wooden flute may compel all r monsters (or just the rats) within its audible range (or the whole level) to move closer to you or follow you, a reference to the Pied Piper of Hamelin.
An artifact that occasionally polymorphs the monsters it hits.
Invoking artifacts for invisibility makes you visible again if you are already permanently invisible. Also, move the Orb of Detection’s invoke invisibility ability to some lesser artifact because it’s a lame power for a quest artifact.
Izchak sells scrolls and wands of light, maybe spellbooks too, at low frequencies.
Fruit juice turns into booze all on its own if you leave it alone for long enough.
Artifact flail or short sword, the Debugger. Deals double damage to all a-class, s-class, and x-class monsters.
Hitting a fountain with a ray of cold or cold blast freezes and breaks it, creating frozen pools in the area.
If you happen to get teleported while you are _ traveling and you have teleport control, the cursor is automatically placed on where you wanted to travel to. (It doesn’t automatically teleport you there - you are still able to move the cursor around before doing the teleport.)
Possibly, add an option to toggle this behavior off, though it’s hard to imagine why someone wouldn’t want it.
If you apply a mirror at an empty square and that square is a “corner” (in a corridor), you gain temporary vision in the perpendicular line around that corner. If it’s a T-junction you look both ways. There is a “Done.” at the end like detect monsters has.
Make the Wizard of Yendor’s corpse always taste terrible.
Fix flavor of steam vortex messages. “You’re being boiled alive!” and “Mmm, a sauna” if fire resistant. If you aren’t carrying a towel, “You wish you had brought your towel to the sauna”.
Object property “frost walker”, which only generates on boots. When worn, lava cools into solid floor and water freezes into ice in a radius 1 around the wearer. Optional if they unfreeze afterwards. Alternatively, make this an artifact pair of water walking boots.
When potions break on the ground, they leave puddles of that potion. Pets can drink this puddle to get the effects. They also give effects (vapor effects, plus acid burning) to any monster standing in them, which is nice because it makes it harder for the player to stand in one place and fight a horde of enemies. Not defined what should happen if multiple potions mix in one spot - alchemize perhaps.
Rework hard helmet mechanics so that for large objects like boulders, they only take a few points off if anything.
Figurines cost 50 times their monster’s base level (or some other constant).
Polymorph, teleport and levelport traps should disappear once used by any monster (including the player). Or else they have a low-ish chance of disappearing per each use.
You can set some fixed inventory letters in the config file, so you don’t have to adjust them manually. In its simplest form, this would apply only to starting inventory, and would allow things like a Tourist’s credit card to be guaranteed to be placed on a familiar letter.
All H can step out of a pit in 1 turn.
Overhaul poison so that its effects are less random: some might still cause instadeath, but it would only be found in the late game or via bosses like Demogorgon and Scorpius; early game poison shouldn’t drain multiple stat points at once.
Ensure that roles that start with spellbooks always have enough Pw for one castable spell.
Dropping an item on an altar to Moloch may, in some cases, curse the item. Ideally this should not be exploitable, so things like a very small chance per drop of an item would not be good. Maybe tied to object ID number if that can’t be exploited.
If you end the game by ascending, you get a fixed baseline score instead of one based on the maximum dungeon level reached. Complementary YASI: this fixed score is zero, so that true zero-point ascensions are possible.
Instead of having Sokoban as a branch, generate occasional Sokoban puzzles in the Dungeons proper. It must not be mandatory to complete them to pass through the level.
When the game looks up the scoreboard to generate a player name for a corpse, statue, or ghost, ignore any games that ended in an ascension.
If someone throws a potion of sleeping at you and you die while asleep, the death should not say “while sleeping off a magical draught”.
A lamp with the same unidentified appearance and base cost as a magic lamp. It is a charged magical tool (has a lifetime, comparable to an oil lamp) that sheds no light, but instead detects unseen in its range whenever it is turned on. This includes invisible monsters, secret doors, and all traps. It also allows vision to penetrate through clouds.
Farlook allows you to see a list of all items on a square as if each were the only item on that square. Items hidden under others are not obscured. Also works if there is a monster standing on the square; you can still see the items under it.
You can jump over swimming monsters in water, and over tiny monsters.
Dwarf kings have a chance of generating with a silver dagger.
Some roles get food appraisal as a permanent intrinsic. Caveman at level 6, Tourist at level 10, maybe Healers at level 1 but they already get poison resistance so maybe not.
When invisibility is about to time out, give the player a warning message “You thought you saw yourself for a moment” (“You seem to unfade for a moment” if you can see invisible, “You feel introspective for a moment” if hallucinating.
Players can polymorph dungeon features by zapping a polymorph beam down at it, with some special cases:
Several small spellbook additions:
