Dragon, Red Very Old (CR 20)

Gargantuan Dragon (Fire)
Alignment: Always Chaotic Evil
Initiative: +0; Senses: darkvision 60 ft. and low-light vision
Languages: Draconic


AC: 36 (-4 size, +30 natural), touch 6, flat-footed 36
Hit Dice: 31d12+248 (449 hp); DR: 15/magic
Fort +25, Ref +17, Will +23
Speed: 40 ft., fly 200 ft. (clumsy)
Space: 20 ft./15 ft. (20 ft. with bite)
Base Attack +34; Grapple +60
Attack: 1 Bite +40, 2 claws +35, 2 wings +35, 1 Tail Slap +35, 1 crush +35, 1 Tail sweep +35 melee; Breath +40 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 18d10 (33)
Special Attacks/Actions: Breath weapon, fear (DC 31), SR 26
Abilities: Str 37, Dex 10, Con 27, Int 22, Wis 23, Cha 22
Special Qualities: Fire subtype, Locate object, Suggestion, CL 13th, Can also cast cleric spells and those from the Chaos, Evil, and Fire domains as arcane spells
Feats: #Feats: 11
Skills: Skill points: 192 and plus Jump 31
Advancement: 32-33 HD (Gargantuan)
Climate/Terrain: Temperate and warm hill, mountains, and underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure: Double Standard

Source: Monster Manual

Combat

Breath Weapon (Su): A red dragon has one type of breath weapon, a cone of fire (18d10 damage, Reflex save for half damage DC 33). 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.

Locate Object (Sp): The dragon can use this ability as the spell of the same name, 9 times per day.

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.