Mud Mephit

(from 5th Edition Monster Manual - 2014):

Mud mephits are slow, unctuous creatures of earth and water. They drone their complaints to all who will listen, and beg incessantly for attention and treasure.

(from Planescape: Monstrous Compendium Appendix I - 1994):

These unctuous creatures sidle up to strangers and, in purring, sibilant voices, use flattery to ingratiate themselves. "Oooh, what sssplendid armor! You know, you wear that armor with sssuch, sssuch authority, I feel myssself quite overwhelmed." After a few minutes of this, or as much as the target can stand, the mephit asks for "a loan" of 100 gold pieces. 

Ooze mephits are made of ochre muck, just like their home plane. They have a rough humanoid form hut no clear joints, and their wings are transparent green bubble membranes that seldom break. They have dark green eyes and mouth with a mooning expression, and they smell absolutely terrible in a 30' radius. 

Contact with an ooze mephit stains clothing permanently. 

Combat: Ooze mephits attack with two claws (ld3 damage each), hut avoid combat when possible. Their breath weapon, usable every other round without limit, is an invisible cloud of gas that works as a stinking cloud (no range, 10' radius) cast at 3rd level of magic use. Other rnephits are immune. 

Once per hour an ooze mephit can gate in another ooze mephit. Ooze mephits are immune to cutting or impaling damage and to fire and water attacks of all types, but transmute mud to rock destroys them instantly. They regenerate 1 hp per round in stagnant water. 

Ecology: Ooze mephits are created to clean sewage lines, maintain garbage dumps, and carry out other necessary but unpleasant duties. They quickly desert and become beggars. With the money they beg, ooze mephits hire wizards to transform them into more desirable forms: humans, elves, dwarves, even koholds.

(From 3.5e Monster Manual I - 2003):

This loathsome, winged creature looks like a miniature human composed of muck and filth. The creature has a terribly offensive odor, and slime dribbles from its body. 

Ooze mephits come from the Elemental Plane of Water. An ooze mephit is about 4 feet tall and weighs about 30 pounds. 

Ooze mephits speak Common and Aquan.

Combat:

Breath Weapon (Su): 10-foot cone of caustic liquid, damage 1d4 acid, Reflex DC 13 half. Living creatures that fail their saves are tormented by itching skin and burning eyes unless they have immunity to acid or are otherwise protected. This effect imposes a –4 penalty to AC and a –2 penalty on attack rolls for 3 rounds. The save DC is Constitution-based and includes a +1 racial bonus. 

Spell-Like Abilities: Once per hour an ooze mephit can hurl an acidic blob that functions like Melf ’s acid arrow (caster level 3rd). Once per day it can create a mass of smelly fog that duplicates the effect of stinking cloud (DC 15, caster level 6th). The save DC is Charisma-based. 

Fast Healing (Ex): An ooze mephit heals only if in a wet or muddy environment. 

Skills: An ooze mephit has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.