Dragon, Bronze Very Old (CR 19)

Huge Dragon (Water)
Alignment: Always Lawful Good
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

AC: 37 (-2 size, +29 natural), touch 8, flat-footed 37
Hit Dice: 30d12+180 (375 hp); DR: 15/magic
Fort +23, Ref +17, Will +23
Speed: 40 ft., fly 150 ft., (poor), swim 60 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +33; Grapple +52
Attack: 1 Bite +39, 2 claws +34, 2 wings +34, 1 Tail Slap +34, 1 crush +34 melee; Breath +39 ranged
Damage: 1 bite 2d8+11, 2 claws 2d6+5, 2 wings 1d8+5, 1 tail slap 2d6+16, 1 crush 2d8+16, Breath weapon 18d6 (31)
Special Attacks/Actions: Breath Weapon, fear (DC 31), SR 26
Abilities: Str 33, Dex 10, Con 23, Int 22, Wis 23, Cha 22
Special Qualities: DR 15/magic, Detect thoughts, Create food and water, fog cloud, Electricity immunity, water breathing, speak with animals, Polymorph self , CL 13. Can also cast cleric spells and those from the Animal, Law, and Water domains as arcane spells.
Feats: #Feats: 11
Skills: Skill points: 186
Advancement: 31-32 HD (Huge)
Climate/Terrain: Temperate and warm aquatic and underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard

Source: Monster Manual

Breath Weapon (Su): Bronze dragons have two types of breath weapon, a line of lightning (18d6 damage Reflex save for half damage DC 31) or a cone of repulsion gas. Creatures within the cone must succeed at a Will save (DC 31) or be compelled to do nothing but move away from the dragon for 1d6 rounds plus 9 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.

Alternate Form(Su): A young or older bronze dragon can assume any animal or humanoid form of Medium size or smaller as a standard action three times per day. A dragon can remain in its animal or humanoid form until it wishes to assume a new one or return to its natural form. A true seeing spell or ability reveals the creature's natural form. A creature using alternate form reverts to its natural form when killed, but separated body parts retain their shape. A creature cannot use alternate form to take the form of a creature with a template.

Frightful Presence (Ex): A young adult or older dragon can unsettle foes with its mere presence. The ability takes effect automatically whenever the dragon attacks, charges, or flies overhead. Creatures within a radius of 270 feet are subject to the effect if they have fewer HD than the dragon (30).

A potentially affected creature that succeeds at a Will save (DC 31) remains immune to that dragon's frightful presence for one day. On a failure, creatures with 4 or fewer HD become panicked for 4d6 rounds and those with 5 or more HD become shaken for 4d6 rounds.

Dragons ignore the frightful presence of other dragons.

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.