Aligned priests can use turn undead against undead monsters they want to attack. “Want to attack” is not currently well-defined for priests vs undead in NetHack, but it would probably follow these rules:

• High priests don’t turn undead, for simplicity.
• Priests of Moloch turn the player if they are polymorphed into an undead, but don’t turn other undead monsters.
• Other priests turn undead that are near them, whether that is the player or not. This opens up an interesting strategy where you can flee from undead into a temple and the priest will help you out.

New special room “cursed graveyard”. Its initial generation is the same as a regular graveyard. The difference is that it generates undead monsters on open spaces in the graveyard (with messages like “A zombie claws out of the ground!”) at a much higher frequency than normal, so long as there is still a gravestone existing within the graveyard. When all gravestones in the graveyard are destroyed, the room converts to a normal graveyard and undead stop spawning.

Gravestone texts in a cursed graveyard don’t draw from the regular pool of gallows-humor messages. They instead use a separate pool of ominous, vengeful, and threatening messages.

Regular gravestone-destroying penalties do not apply if the gravestone being destroyed is in a cursed graveyard.

Priests can destroy a headstone in a cursed graveyard by #turning while standing on it.

Zombies destroyed by turning never leave corpses, or the corpses they do leave are incapable of reviving.

Anyone who wields Sunsword can perform the #turn command, which is flavored as brandishing the sword threateningly.

When undead are destroyed outright by any turn undead effect, they never leave a corpse.