Maid
@ maid  

Difficulty  13 
Attacks 
Weapon 1d6 physical, Offhand Weapon 1d6 physical 
Base level  11 
Base experience  374 
Speed  12 
Base AC  0 
Base MR  0 
Alignment  5 (lawful) 
Frequency (by normal means)  3 (Rare) 
Genocidable  Yes 
Weight  1450 
Nutritional value  400 
Size  medium

A maid:

A maid, @ is a type of monster that appears in dNetHack and notdNetHack. The maid is a human monster that can be seen via infravision.
A maid has a weapon attack and an offhand weapon attack.
Contents
Generation
A maid always generates with four separate daggers, with an independent chance for each of the following: a ^{1}⁄_{4} chance of a stack of shuriken, a ^{1}⁄_{2} chance of a stack of darts, and a ^{1}⁄_{100} chance of a silver dagger. Maids also generate with different additional armor and weapons, dependent on the role of the hero:
 For nonSamurai, maids will be generated with either a katana (^{7}⁄_{10} chance) or a stiletto (^{3}⁄_{10} chance).
 For Samurai, the maid has a chance of being given one of the following primary weapons, with each case falling through to the next:
 A ^{1}⁄_{20} chance of a naginata, otherwise;
 A ^{1}⁄_{4} chance of a katana, otherwise;
 A ^{1}⁄_{2} chance of a broadsword, otherwise;
 An effective ^{1}⁄_{5} chance of a stiletto, if none of the above are generated.
Cleaning up
A maid will 'tidy up' the dungeon by picking up any and all loose items, regardless of if she is hostile towards the hero. When a maid picks up certain kinds of item, she may mend it if has any erosion or clean it up, unless it is a unique item or an artifact. The possible kinds of cleaning are as follows:
 A maid that picks up a rusty item has a ^{21  X}⁄_{20} chance of repairing the rust, where X is the number of levels of rust, and will otherwise destroy it (i.e. she will always repair items that are only "rusty").
 A maid that picks up a burnt item has a ^{21  4*X}⁄_{20} chance of repairing the burns, where X is the number of levels of burns, and will otherwise destroy it.
 A maid that picks up a corroded item has a ^{13  X}⁄_{12} chance of repairing the corrosion, where X is the number of levels of corrosion, and will otherwise destroy it (i.e. she will always repair items that are only "corroded").
 A maid that picks up a rotted item has a ^{13  4*X}⁄_{12} chance of repairing the rot, where X is the number of levels of rotting, and will otherwise destroy it.
 A maid that picks up a container with a broken lock will mend the lock.
 A maid that picks up a cursed item has a ^{4}⁄_{5} chance of uncursing it, and will otherwise banish it to the vibrating square level in Gehennom by drawing a semipermanent pentagram ward in ink.
 If a maid picks up a dwarvish helm, an oil lamp, a lantern, or a lantern plate mail, and it has less than 750 turns of light remaining, then she will recharge it to add another 750 turns.
 If a maid picks up an expensive camera with less than 50 charges remaining, then she will replace the film, which leaves the camera with 6075 charges.
Strategy
A player who does not yet know the pentagram can learn the ward by leaving cursed items near a peaceful or pacified maid.
Origin
The maid's starting equipment is an allusion to the "ninja maid" trope that appears in contemporary media.
Of note is that maid clothing such as the maid dress, frilled apron, and katyusha can be found in NetHack brass, but maids themselves do not appear.
A user has suggested improving this page or section as follows:
"Maid movement AI in monmove.c. Maid blood alchemy effects. I don't think maids pick up literally everything, if I'm reading the code right, but the full list is hard to summarize because it includes searches_for_item()."