n small aquatic elemental water 

Perception +3; darkvision

Languages Aquan

Skills Athletics +6, Stealth +6

Str +1 Dex +3 Con +1 Int -2 Wis +0 Cha +0

AC  16; Fort +7, Ref +11, Will +4

HP 20, fast healing 2 (while underwater); Immunities bleed, poison, paralyzed, sleep

Speed 20 feet, fly 25 feet, swim 25 feet

Melee [>] claw +8 (finesse), Damage 1d6+1 slashing

Breath Weapon [>>] (acid, arcane) The water mephit breathes acid in a 15-foot cone that deals 2d6 acid damage to each creature within the area (DC 17 basic Reflex save). The water mephit can't use Breath Weapon again for 1d4 rounds.

Drench [>] (abjuration, arcane, water) The water mephit puts out all fires in a 5-foot emanation. The mephit extinguishes all non-magical fires automatically and attempts to counteract magical fires (+7 counteract modifier).

Bestiary, page 151. Expanded in LOIL.