Dragon, White Young (CR 3)

Medium Dragon (Cold)
Alignment: Always Chaotic Evil
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

AC: 18 (+8 natural), touch 10, flat-footed 18
Hit Dice: 9d12+18 (76 hp)
Fort +8, Ref +6, Will +6
Speed: 60 ft., fly 200 ft. (poor), swim 60 ft., burrow 30 ft.
Space: 5 ft./5 ft.
Base Attack +9; Grapple +11
Attack: 1 Bite +11, 2 claws +6, 2 wings +6 melee; Breath +11 ranged
Damage: 1 bite 1d8+2, 2 claws 1d6+1, 2 wings 1d4+1, Breath weapon 6d6 (16)
Special Attacks/Actions: Breath weapon
Abilities: Str 15, Dex 10, Con 15, Int 6, Wis 11, Cha 6
Special Qualities: Cold subtype, icewalking
Feats: #Feats: 4
Skills: Skill points: 1
Advancement: 10-11 HD (Medium-size)
Climate/Terrain: Any cold land and underground
Organization: Solitary or clutch (2-5)
Treasure/Possessions: Double Standard

Source: Monster Manual

Breath Weapon (Su): A white dragon has one type of breath weapon, a cone of cold (3d6 cold damage, Reflex save for half damage DC 16). Using a breath weapon is a standard action. Once a dragon breathes, it can't breathe again until 1d4 rounds later. A blast from a breath weapon always starts at the dragon's mouth and extends in a direction of the dragon's choice.

Cold Subtype

A creature with the cold subtype has immunity to cold. It has vulnerability to fire, which means it takes half again as much (+50%) damage as normal from fire, regardless of whether a saving throw is allowed, or if the save is a success or failure.