If you turn to stone by hitting a cockatrice with a bare-handed attack, the death reason should not be “petrified by a cockatrice” which makes it sound like the cockatrice’s attack did you in, but should instead be “petrified by punching a cockatrice bare-handed”.
Cockatrice corpses when eaten should have a chance of conveying permanent stoning resistance.
The game should play sounds (if on a supported platform) or at least provide the hook for playing sounds in several scenarios: wielding a cockatrice corpse, experiencing a psychic blast from a mind flayer, and one that plays constantly at low HP which is supposed to be annoying.
On April 20, all petrifying attacks of monsters have the same effects they do on a new moon, i.e. making stoning more likely.
There should be some special effect, even just an acknowledging message, when trying to apply a mirror to a cockatrice, since the encyclopedia mentions its own reflection is fatal to it and the materials to make it look at its reflection exist in the game.
When polymorphed into a form that has automatic bite or other melee-touching attack, if you are about to attack a cockatrice, make it subject to an Intelligence saving throw; if you pass this you avoid attacking the monster with your body.
Lizards and cockatrices/chickatrices should grudge each other.
If you deliver a staggering blow or other knockback to a cockatrice, and there is a monster behind it, that monster might get stoned.
Petrification sources need to be made more consistent - logically, “The cockatrice touches you!” should have the same effect as touching its corpse, but instead it is a mere 1/30 chance of starting a delayed petrification.
Deafness should provide total protection against cockatrices’ hissing attacks.
Deafness protects against cockatrice hissing and therefore their stoning. (This might be too powerful; it might need to just reduce the chance of stoning rather than eliminating it altogether.)
If you hit a cockatrice with a corpse of a non-petrification-resistant monster, the corpse turns into a statue.
