rare cn gargantuan dragon elemental fire 

Perception +33; darkvision, scent (imprecise) 60 feet

Languages Common, Draconic, Ignan, Terran, Undercommon

Skills Acrobatics +28, Athletics +36, Deception +28, Intimidation +34, Nature +28, Stealth +28, Survival +29

Str +8 Dex +4 Con +6 Int +4 Wis +5 Cha +6

AC  42; Fort +34, Ref +30, Will +31; +1 status to all saves vs. magic

HP 390; Immunities fire, paralyzed, sleep; Weaknesses cold 15

Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 37

Wing Deflection [R] Trigger The dragon is targeted with an attack; Effect The dragon raises a wing, gaining a +2 circumstance bonus to AC against the triggering attack. If the dragon is Flying, they descend 10 feet after the attack.

Speed 50 feet, fly 200 feet; magma swim 50 feet

Melee [>] jaws +36 (magical, reach 20 feet), Damage 3d10+16 piercing plus 4d6 fire

Melee [>] claw +36 (agile, magical, reach 15 feet), Damage 3d10+16 slashing

Melee [>] tail +34 (magical, reach 25 feet), Damage 3d12+16 bludgeoning

Melee [>] horns +34 (magical, reach 20 feet), Damage 3d10+16 piercing

Primal Innate Spells DC 40, attack +32; 8th burning hands (at will), fireball, wall of fire (at will); Cantrips (8th) produce flame; Constant (4th) fire shield

Breath Weapon [>>] (evocation, fire, primal) The dragon breathes a blast of magma that deals 10d6 fire damage and 5d12 bludgeoning damage in a 60-foot cone (DC 40 basic Reflex save). They can't use Breath Weapon again for 1d4 rounds.

Draconic Frenzy [>>] The dragon makes two claw Strikes and one horn Strike in any order.

Draconic Momentum The dragon recharges their Breath Weapon whenever they score a critical hit with a Strike.

Magma Swim A magma dragon's swim Speed functions only when the dragon is Swimming through magma or molten lava.

Magma Tomb [>>] Once per day, the dragon can spit a molten boulder at a target within 120 feet. This deals 12d6 fire damage and 5d12 bludgeoning damage, with a DC 42 basic Reflex save. If the creature fails its save, it's encased in magma that instantly cools and has Hardness 10, HP 40, and BT 20. The encased creature can't breathe and is restrained (Escape DC 42).

Volcanic Purge [>] If the next action the dragon uses is Breath Weapon, the magma clings to those it damages. Each creature that fails its save against the Breath Weapon takes 5d6 persistent fire damage, and as long as it has this persistent fire damage, it also takes a –10-foot status penalty to its Speeds.

Bestiary 2, page 95.