Skeletons, or any other monster with MS_BONES, don’t paralyze you by rattling their bones if you’re hallucinating; instead you get a message about it playing the xylophone.
Other priest benefits: the chance of receiving a sacrifice gift is doubled, make it easier to get crowned or other high boons, the prayer timeout isn’t increased when crowned.
Priests can sacrifice corpses anywhere, with no need for an altar, except in Gehennom. (This should be strictly worse than altar sacrifice - maybe it only reduces prayer timeout, by less than it would normally, and can’t result in gifts.)
Elementals fire back weapons you throw at them with additional force (dealing additional damage to you): water elementals in a geyser, fire elementals burning with primal flame, air elementals in a gust, earth elementals in a shower of rocks (or they just incorporate the weapon into themself and become stronger, dropping it on death).
The Oracle has the same item as the prize in Sokoban, so you can pay her to tell you what the prize is (because she’ll have it with her). This opens up a strategic choice where players can decide whether to kill her and skip Sokoban, or not. She will need to be quite stronger than her current abilities are, with passive attacks that work even at range. Alternatively, she could carry the other Sokoban item, depending on how formidable she is.
The scroll of destroy armor, when confused, cursed, and naked, grants temporary disintegration resistance.
A Minesweeper minigame where you start in an empty zone with a pickaxe. You can always move diagonally through gaps without dropping anything. The amount of mines next to a tile are represented by rock piles on the ground, and you can throw single rocks to embed them in walls to flag mines. Every mine hit causes an explosion that damages, wounds legs, scatters inventory, and penalizes Luck.
Remove the ability of ID scrolls to give a full inventory ID, or make blessed ones give a guaranteed type-ID of everything in inventory. Confused blessed scrolls of ID give a full ID of charges, beatitude, and enchantment on all items in inventory, but NOT type-identification.
Artifact chaotic amulet Amulet of Splendor: provides every single amulet effect, as well as unchanging-ignoring controlled polyself when invoked. Wearing it conveys life saving (this WILL disintegrate the amulet if triggered), magical breathing, unchanging, poison resistance, ESP, reflection, strangulation (doesn’t kill you due to magical breathing but maybe it makes it so you can’t eat food or something while wearing it, or it autocurses), restful sleep, and gender change for as long as you wear the amulet. Base type is a cheap plastic imitation of the Amulet of Yendor.
On Valentine’s Day, succubi (or any female seducer) steal candy bars you are carrying, and incubi give you candy bars.
Strength should not give a to-hit bonus; the encumbrance system is already there to address that.
The Master Assassin offers you the Bell of Opening if you will leave him in peace and let him keep the Master Key. If the player wants to play a chaotic good rogue, they are able to go back and kill the Master of Thieves (without immediately being kicked out of the quest), after which the Master Assassin will give you the Master Key.
Racial shopkeepers give the player discounts. This could be in the form of a direct buy price reduction (must be capped at 50% of the base cost though to prevent farming) or treating the player as if they had higher Charisma. If the shopkeeper hates your race (for example, elves versus orcs), they will also block the entrance to the store as if you were carrying a pickaxe.
If a pet nurse is next to you and you choke over food, it does the Heimlich maneuver on you and you vomit voluminously.
Tourists start with a leash.
