Dragon, Brass Very Old (CR 18)

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

AC: 35 (-2 size, +27 natural), touch 8, flat-footed 35
Hit Dice: 28d12+168 (350 hp); DR: 15/magic
Fort +22, Ref +16, Will +20
Speed: 60 ft., fly 200 ft. (poor), burrow 30 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +31; Grapple +49
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+10, 2 claws 2d6+5, 2 wings 1d8+5, 1 tail slap 2d6+15, 1 crush 2d8+15, Breath weapon 9d6 (30)
Special Attacks/Actions: Breath weapon, fear (DC 25), SR 23
Abilities: Str 31, Dex 10, Con 23, Int 18, Wis 19, Cha 18
Special Qualities: Control winds, Suggestion, Fire subtype, speak with animals, Endure elements, CL13, Can also cast cleric spells and those from the Chaos and Knowledge Domains as arcane spells
Feats: #Feats: 10
Skills: Skill points: 118
Advancement: 29-30 HD (Huge)
Climate/Terrain: Temperate and warm desert, plains, and underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard

Source: Monster Manual

Breath Weapon (Su): A brass dragon has two types of breath weapon, a line of fire (9d6 damage Reflex save for half damage DC 30) or a cone of sleep. Creatures within the cone must succeed at a Will save (DC 30) or fall asleep, regardless of HD, for 1d6 rounds plus 9 rounds. 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.

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

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 (28).

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.