Vampires shifted into some other form should appear on warning as their true difficulty, rather than the difficulty of their current form. Attentive players are then rewarded for noticing that a wolf or fog cloud is an unusual difficulty 4.

Vampires will not enter a temple that has a priest in residence.

Human (and possibly humanoid) monsters killed by a vampire’s drain attack (not its weapon or physical bite damage) should have a long timeout set on their corpses to revive them as a vampire. If the player or a pet was the one that killed them, they should revive tame.

Vampires shouldn’t be able to harm any monsters with a bite attack if the victim is bloodless, not dealing any damage or level drain. (Also includes the player if polymorphed into a bloodless form.)

Fix vampires shifting into fog clouds as an escape method because this doesn’t currently work with fog clouds being slow and easily killed.

• Normal fog clouds can still be slow, but vampshifted fog clouds should have their regular form’s speed.
• Fog clouds in general should be very hard to land a hit on, with “your attack passes harmlessly through” like a ghost nearly all the time (allowing critical hits only?), or all of the time, if you are not engulfed. Fog clouds that are fleeing, like vampires running away, will not engulf the player.
• If a vampshifted fog cloud is pinned down and has nowhere to go, it can pass through the squares of a number of monsters blocking its way and land somewhere else, provided that space is within a few spaces. This prevents the player from trapping it in a corner and beating it to death.
• At some point, the vampire must turn itself back to normal, and not stay in fog cloud form forever.

Remove/replace the guaranteed L and V monsters from Astral; the priests shouldn’t tolerate random high level undead hanging around.

Spell of necromancy that turns a corpse you’re standing on (or possibly adjacent to you) into a tame undead. Probably in the clerical school, though a case could be made for matter (and certain variants have a school of necromancy which this would much more directly fit into). It will work on corpses of undead that you have killed. Casting this spell would have some sort of penalty for lawfuls; there would be some sort of warning before trying to cast it.

You can normally only create zombies or mummies when an undead monster exists for the kind of corpse you are animating (i.e. a jackal can’t be turned into undead but a gnome can turn into a gnome zombie/mummy). For intelligent monsters that have no counterpart, the spell can create ghosts.

At a high enough skill or caster level, you can create skeletons from the corpse of any vertebrate, and maybe even vampires from humanoids. You can also create wraiths and shades from monsters that have no undead counterparts.

Not all vampires are capable of shapechanging. Some of them will remain in their ordinary form. A smaller fraction of vampire lords is the same.

Vampires grudge werewolves.

When a vampire is killed in shapeshifted form and reincarnates in its normal form, it comes back at half health. Due to this, vampire AI sometimes chooses to stay in normal form at full health.

Vampires can only regenerate while standing on top of a gravestone or in a graveyard. (Ideally, they could only regenerate in a coffin, but nethack lacks those.)

Vampires drain levels much less than they currently do, or not at all; instead they use a bite with an AD_DRHP damage type (described in #1627). Possibly give vampires one AD_DRHP attack but let vampire lords keep one AD_DRHP and one AD_DRLI.

Elven daggers and arrows (and really any pointy wooden weapon) has a 5% chance of instakilling any vampire who is not wearing body armor.

Sunsword does extra damage to vampires and trolls, on top of its normal bonuses versus undead.

Hitting vampires or all undead with light should hurt them. Not to the extent of gremlins though.

Vampires can’t step onto sinks, because they “can’t cross running water”.

Buff late-game undead, because undead’s significance in Gehennom tends to be pointless since they aren’t scary by the time the adventurer gets there.

• Zombies can resurrect in Gehennom akin to GruntHack zombies.
• Spectres, which are like wraiths but much faster and with more attacks.
• Vampire mages.
• Skeletal dragons.
• Minotaur zombies.
• Z might need to be made ungenocideable.
• GruntHack-like zombies, which inflict zombification sickness and eat your brain to drain Int.
• Shades can generate in graveyards in Gehennom.