Dragon, Gold Mature Adult (CR 18)

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

AC: 33 (-2 size, +25 natural), touch 8, flat-footed 33
Hit Dice: 26d12+156 (325 hp); DR: 10/magic
Fort +21, Ref +15, Will +20
Speed: 60 ft., fly 200 ft. (poor), swim 60 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +26; Grapple +46
Attack: 1 Bite +36, 2 claws +31, 2 wings +31, 1 Tail Slap +31, 1 crush +31 melee; Breath +36 ranged
Damage: 1 bite 2d8+12, 2 claws 2d6+6, 2 wings 1d8+6, 1 tail slap 2d6+18, 1 crush 2d8+18, Breath weapon 14d10 (29)
Special Attacks/Actions: Breath Weapon, fear (DC 28), SR 25
Abilities: Str 35, Dex 10, Con 23, Int 20, Wis 21, Cha 20
Special Qualities: Luck bonus, Bless, Fire subtype, water breathing, polymorph self, CL 9 *Can also cast cleric spells and those from the Law, Luck, and Good domains as arcane spells
Feats: #Feats: 9
Skills: Skill points: 136 and plus Jump 26
Advancement: 27-28 HD (Huge)
Climate/Terrain: Any land and underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard

Source: Monster Manual

Breath Weapon (Su): A gold dragon has two forms of breath weapon, a cone of fire (14d10 damage, Reflex save for half damage DC 29) or a cone of weakening gas. Creatures within the latter must succeed at a Fortitude save (DC 29) or take 7 points of temporary Strength damage. Using a breath weapon is a standard action. Once a dragon breathes, it can't breathe again until 1d4 rounds later. If the dragon has more than one type of breath weapon, it still can breathe only once every 1d4 rounds. A blast from a breath weapon always starts at the dragon's mouth and extends in a direction of the dragon's choice.

Fire Subtype (Ex): Fire immunity, double damage from cold except on a successful save.

Alternate Form(Su): A gold 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.

Water Breathing (Ex): The dragon can breathe underwater indefinitely and can freely use its breath weapon, spells, and other abilities while submerged (the cone of fire becomes a cone of superheated steam underwater).

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 210 feet subject to the effect if they have fewer HD than the dragon (26).

A potentially affected creature that succeeds at a Will save (DC 28) 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.

Fire Subtype

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