Dragon, Bronze Very Young (CR 4)

Medium Dragon (Water)
Alignment: Always Lawful Good
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+8 (76 hp)
Fort +8, Ref +6, Will +8
Speed: 40 ft., fly 150 ft., (poor), swim 60 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 4d6 (16)
Special Attacks/Actions: Breath Weapon
Abilities: Str 15, Dex 10, Con 15, Int 14, Wis 15, Cha 14
Special Qualities: Electricity immunity, water breathing, speak with animals
Feats: #Feats: 4
Skills: Skill points: 24
Advancement: 10-11 HD (Medium-size)
Climate/Terrain: Temperate and warm aquatic and underground
Organization: Solitary or clutch (2-5)
Treasure/Possessions: Double Standard

Source: Monster Manual

Breath Weapon (Su): Bronze dragons have two types of breath weapon, a line of lightning (4d6 damage Reflex save for half damage DC 16) or a cone of repulsion gas. Creatures within the cone must succeed at a Will save (DC 16) or be compelled to do nothing but move away from the dragon for 1d6 rounds plus 2 rounds. This is a mind-influencing compulsion enchantment. 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.

Water Subtype

This subtype usually is used for elementals and outsiders with a connection to the Elemental Plane of Water. Creatures with the water subtype always have swim speeds and can move in water without making Swim checks. A water creature can breathe underwater and usually can breathe air as well.