The brownie, n, is a small fairy-like creature that appears in SLASH'EM. It is essentially a spellcasting counterpart to the nymph, and is a member of the nymph monster class, sharing its glyph with the mountain nymph.
Like nymphs, brownies are almost always generated asleep.
Brownies are especially dangerous when awake; they are fast and possess spells such as destroy armor and curse items, on top of being able to steal items and teleport away. They also have many more hit dice than the typical nymph, although they only have one seduction attack.
Brownies are often best avoided - while not a particularly damaging threat, they are generally not worth the risk of having items cursed, stolen or, in the case of armor, destroyed. It is well worth to check if that n is a brownie or a mountain nymph. If dealing with an awakened brownie, they can be dispatched most safely using available ranged weapons and/or Elbereth; even with magic resistance, allowing them to get within melee range can potentially lead to the brownie whisking your source of MR off your person.