The scroll, wand, and spellbook of light should all weigh less than other objects of those classes. This makes them trivially identifiable, but it isn’t considered game breaking to be able to tell these 3 objects.

New monster, enchanted snowman, based on Frosty the Snowman.

It is never randomly generated, but is instead supposed to be assembled by the player as an ally. Assembling it requires the following:

• A top hat, which is implemented as a helm which conveys no AC like the fedora. If being true to the source material, this would be a magical piece of armor, but it’s unclear what magical effect it would have.
• A corncob pipe and button nose, which are new tool-class objects that are unusually heavy for their size (with a message like “This feels unnaturally heavy for such a small object” when you lift them). Arguably, the button nose should be gem-class instead of a tool. The heaviness is intended to discourage carrying around lots of these.
• Alternatively, instead of the button nose, an ordinary carrot.
• Presumably, some source of snow or ice, likely implemented by simply requiring ice terrain (which means a source of cold magic is required for most heroes).

The exact mechanism or commands required to assemble it are not specified.

Once assembled, it has the following properties:

• Has extremely high attack and defense, and is moderately fast.
• Will melt in 100 turns, or 250 turns if standing on ice.
• It will usually be tame, influenced by your Luck, with a hard upper bound of 95%. It will otherwise be hostile.
• If it loses the top hat for any reason, it instantly dies.
• It should drop some of the material components used in its creation when it dies, although probably not all of them (otherwise you could make new ones using all the same items).

A quest that is filled with Chinese lore and new monsters from Chinese folklore. Possibly a variant of an alignment quest, or a straightforward implementation of the Monk quest, or a Noble quest for a race which doesn’t already have an overridden alternative Noble quest.

Beholder corpses have a chance of conveying a Charisma increase accompanied, if you are hallucinating, by the message “Beauty is truly in the eye of the beholder.” Alternatively, do not have a message, but add this line as a comment in the source explaining why a beholder would grant Charisma.

Hitting a monster with a headbutt attack while wearing the War-helm of the Dreaming causes that monster to be put to sleep.

In variants which allow weapons and armor to be different sizes: giants can use a gigantic-sized sling to fire boulders.

Some priests, not all, should be able to speak sign language so you can purchase protection from them even if you are playing the game permadeaf.

Remove centaurs’ ability to wear body armor, but allow them to wear barding instead.

The spell of light has an advanced form that makes you a light source for some temporary length of time, flavored as summoning an incorporeal globe of light that follows you around.

Infidels are the opposite of priests, so they should only be allowed to use edged weapons and be banned from using just-piercing or blunt weapons, as an inverse of priests’ weapon restrictions.

Allow a random set of player monsters to not know about blowing up bags of holding. Ones that do know about it will avoid storing items in a bag of holding they’re carrying that would blow it up; ones that don’t will store anything, and may blow up the bag if they insert a dangerous item.

Modify iron balls so that they become a viable weapon to use. This means they need to be enchantable, much lighter than now (possibly the two can be combined and enchanting makes them lighter without reducing the ball’s damage), and still attached to the chain while the other end is not attached to the hero’s leg.

The spell of create familiar should summon more powerful monsters when cast at higher skill; since it’s a clerical spell, the monsters could be drawn from the list of minions your god is capable of summoning.

Unicorns’ headbutt attack is presumably hitting you with its horn, so it should apply the regular effects of a unicorn horn.

When you are expelled from the Samurai quest for failing the alignment test enough times, Lord Sato tells you you should go become a monk. That should happen literally - once you are kicked out of the level, your role changes to Monk and your quest is replaced with the Monk quest.

All bane-type artifacts which don’t already give warning of the monster type they are a bane of, should give warning of those monsters.

It should be impossible to polymorph any unique monster; there are too many of them that can be trivially cheesed by turning them into something weaker.

Randomly spawned bear traps should have a random level of rust applied (which can be no rust). This rust should be present in messages and affect the rustiness of the beartrap item if you untrap it, but should not have any effect on its damage.

If you are polymorphed into a troll and then killed, the game immediately checks the random chance of whether you will automatically revive. If you would not, you simply return to your normal form (or die if you’re wearing unchanging). If you would, you lie dead for a little while until you do revive. This could work via the mechanism that lets you mimic a pile of gold, except you are mimicking a troll corpse instead. If a monster disturbs your corpse prior to your revival, you “die” - for real if you had unchanging, or returning you to your normal form if not.

Getting crowned as a lawful character should unlock the ability to dip for Excalibur if you are currently unable to, or raise the odds for successfully dipping to what Knights get.