Because wildshaping as a Druid is fun and many of its possible polyforms are situational, the cooldown for entering a new form should be short in most cases, but there should still be a penalty for using a form just as a source of bonus HP. Therefore, it should follow these rules:

• If your wildshape polyform times out and you return to natural form, there is no cooldown at all and you can immediately wildshape again.
• If you manually cancel your wildshape, there is a short cooldown on the order of a couple hundred turns.
• If you are killed in your wildshape, there is a long cooldown on the order of 1000 turns.

You might also be able to ignore the cooldown and force a shape change, at the cost of magic power and/or nutrition proportional to either the remaining cooldown amount or the strength of the form you want to take.

Dichotomy, as its name suggests, has a small chance of bisecting creatures it hits.

Ancient dragons, if ever implemented, should have gaze and roar attacks. These were not fully enumerated, but shimmering dragons should have a stunning gaze, gold should have a blinding gaze, etc.

The roar attacks both add some much needed use to the AT_SCRE attack type and prevent you from overcoming the ancient dragons’ additional threat over regular dragons with a simple blindfold.

A themed room that is a dragon’s hoard: a big pile of money and gems (and possibly a couple chests) spanning multiple spaces with a single sleeping (or waiting) dragon on top of it all.

Force-fighting a monster always suppresses any sort of extra attacks you would get (whether from polyform, monk kick attacks, etc), and results in a simple melee attack with your arms or arm-equivalents. This is intended to provide a simple way to fight cockatrices and other dangerous monsters while giving the player responsibility over it: they are not coddled with auto-suppressing of dangerous attacks, but also aren’t required to find some alternate way to fight such monsters. It also resolves the flavor problem of why the hero can’t simply decide not to eat the cockatrice’s brain.

This does not define what force-fighting should do if you are in a form that lacks any claw or weapon attacks.

Eating an amulet of reflection (which doesn’t provide any intrinsic) causes you to “reflect on your inner self”, providing enlightenment.

Artifact polearm of unspecified type The Ten-Foot Polearm. When wielded, it confers immunity to stoning from c corpses, artifact blasts, and special damage from bane artifacts that hate you, because “you don’t touch them with a ten-foot pole”.

It is possible to get a scroll of genocide both blessed and cursed at the same time. The effect of this is that it prompts for a single monster, genocides most of that monster, and sends in the remaining several monsters who are now looking for revenge.

Alternatively, make this a confused effect instead of opening the can of worms of allowing items to be simultaneously blessed and cursed.

A variant cursed effect of a scroll of genocide: it removes most monsters of a given species, but sends the survivors to you looking for revenge.

Greased items that get exposed to fire become flaming for a certain number of turns afterwards (and then the grease is gone).

A simpler version of this idea would be simply to burn off a weapon’s grease when it’s exposed to a fiery monster.