Salt Mephit

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

Salt mephits look like grainy white humanoids with wings made of cubical white crystals. They have large red eyes and gaping, grinning mouths. They have no odor unless they get wet, which causes them excruciating pain and makes them smell briny. 

The sarcastic and acidulous wit of salt mephits lowers their life expectancy dramatically.

Combat: Salt mephits attack with two claws (1d3 damage each); if any claw damage penetrates armor, the pain of the salted wound requires a save vs. petrification or the victim is stunned for 1-2 rounds. Similarly, the salt mephit’s breath weapon is a shower of salt crystals against a single enemy within 15’ (damage 1d4, save vs. petrification or be stunned 1-2 rounds).

Once per day a salt mephit can taunt (as the 1st-level wizard spell); this taunting can be made to originate within 10 yards of the mephit. A salt mephit can contaminate any amount of water up to a barrel by touch, turning it into undrinkable brine.

Once per hour a salt mephit can attempt to gate in another salt mephit. Salt mephits are immune to fire and heat damage of all kinds, but take maximum damage from liquid-based attacks, and even ordinary water does 1 hp damage per round of contact. They regenerate 1 hp per turn automatically, as long as they stay dry.

Ecology: Spellcasters who deliver a nasty, foulmouthed salt mephit to an enemy thereby declare open warfare.

(From 3.5e Monster Manual I - 2003):

This winged creature looks like a miniature human with bleary red eyes and crystalline flesh. 

Salt mephits come from the Elemental Plane of Earth. Salt mephits are sarcastic creatures who loathe water and moisture of any kind. Each one is about 4 feet tall and weighs about 80 pounds. 

Salt mephits speak Common and Terran. 

Combat:

Breath Weapon (Su): 10-foot cone of salt crystals, damage 1d4, Reflex DC 13 half. Living creatures that fail their saves are tormented by itching skin and burning eyes. 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 a salt mephit can use glitterdust (DC 14, caster level 3rd).

Once per day it can draw the moisture from an area in a 20-foot radius centered on itself. Living creatures within range take 2d8 points of damage (Fortitude DC 14 half; caster level 6th). This effect is especially devastating to plant creatures and aquatic creatures, which take a –2 penalty on their saving throws. This ability is the equivalent of a 2nd-level spell. The save DCs are Charisma-based. 

Fast Healing (Ex): A salt mephit heals only if in an arid environment.