Sleet Dragon1
A serpentine head snaps outs of the roiling sleet, as its icy claws tear at your limbs.

Sleet Dragon (CR 5; XP 1,600)
NE Large outsider (cold, elemental, water)
Init +4; Senses darkvision 60 ft., heatsense 120 ft.; Perception +1
Defense
AC 18, touch 13, flat-footed 14
(+4 Dex, +5 natural, -1 size)
hp 59 (7d10+21)
Fort +5, Ref +9, Will +6
Defensive Abilities sleet cloud; Immune cold, elemental traits
Vulnerable fire
Offense
Speed 30 ft., swim 30 ft.
Melee bite +9 (1d8+3 plus 1d6 cold), 2 claws +9 (1d6+3 plus 1d6 cold and grab)
Space 10 ft.; Reach 10 ft.
Special Attacks constrict (1d6+3 plus 1d6 cold)
Statistics
Str 16, Dex 19, Con 16, Int 7, Wis 13, Cha 14
Base Atk +7; CMB +11 (+15 grapple); CMD 25 (29 vs. trip)
Feats Cleave, Cleaving Finish, Power Attack, Vital Strike
Skills Climb +13, Escape Artist +14, Intimidate +12, Stealth +10, Swim +11
Languages Auran, Aquan
Ecology
Environment planes (Realms Within)
Organization solitary or storm (2-7)
Treasure standard
Special Abilities
Chill (Ex) A sleet dragon is unnaturally cold. All of its natural attacks deal an additional 1d6 points of cold damage.
Heatsense (Ex) A sleet dragon can sense the presence of creatures with 120 ft. whose temperature differs significantly from their surroundings, as though they had blindsight.
Sleet Cloud (Su) The perpetual rolling cloud of sleet and fog that surrounds the sleet dragon gives it concealment against ranged attacks.

Though normally called dragons, these dangerous serpent-like beings are actually elementals and originate from the border of the Elemental Planes of Air and Water. Summoning or calling a sleet dragon is relatively easy, as they desire constant movement and new victims to clutch and freeze; they are typically called during foul weather such as blizzards, sleet, and hailstorms. Indeed, a violent hailstorm sometimes opens a crack between the dimensions that sleet dragons prowl the planar veil for, and occasionally one can make the crossing unbidden. As temperamental as the weather systems that accompany them wherever they go, sleet dragons require a strong master, typically one that is immune to cold. They are violent and destructive above the water and below it.

On Porphyra
Sleet dragons were and are a particular favorite companion of ice giants, those scourges of the maritime reaches. Though not large enough for those giants to use as a mount, sleet dragons enjoy serving ice giants as “hounds”, scouting, guarding, and even drawing crude sleds, typically in groups of four or six. Undine wizards practicing the elemental water arcane school of magic (known as the Arlia Cabal) can call forth sleet dragons using planar ally (lesser / greater) as if they were 6 HD creatures instead of 7.