Dragon, Brass Wyrm (CR 20)

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

AC: 39 (-4 size, +33 natural), touch 6, flat-footed 39
Hit Dice: 34d12+238 (459 hp); DR: 20/magic
Fort +26, Ref +19, Will +24
Speed: 60 ft., fly 250 ft. (clumsy), burrow 30 ft.
Space: 20 ft./15 ft. (20 ft. with bite)
Base Attack +34; Grapple +58
Attack: 1 Bite +42, 2 claws +37, 2 wings +37, 1 Tail Slap +37, 1 crush +37, 1 Tail sweep +37 melee; Breath +42 ranged
Damage: 1 bite 4d6+13, 2 claws 2d8+6, 2 wings 2d6+6, 1 tail slap 2d8+19, 1 crush 4d6+19, 1 tail sweep 2d6+19, Breath weapon 11d6 (34)|
Special Attacks/Actions: Breath weapon, fear (DC 29), SR 25
Abilities: Str 35, Dex 10, Con 25, Int 20, Wis 21, Cha 20
Special Qualities: Control weather, Control winds, Suggestion, Fire subtype, speak with animals, Endure elements, CL 17, Can also cast cleric spells and those from the Chaos and Knowledge Domains as arcane spells
Feats: #Feats: 12
Skills: Skill points: 176
Advancement: 35-36 HD (Gargantuan)
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 (11d6 damage Reflex save for half damage DC 34) or a cone of sleep. Creatures within the cone must succeed at a Will save (DC 34) or fall asleep, regardless of HD, for 1d6 rounds plus 11 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 330 feet are subject to the effect if they have fewer HD than the dragon (39).

A potentially affected creature that succeeds at a Will save (DC 32) 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.