n huge elemental fire 

Perception +16; darkvision, smoke vision

Languages Ignan

Skills Acrobatics +20

Str +5 Dex +5 Con +4 Int -1 Wis +3 Cha +0

Smoke Vision The firewyrm ignores the concealed condition from smoke.

AC  28; Fort +18, Ref +20, Will +15

HP 165, explosion; Immunities bleed, fire, poison, paralyzed, sleep; Weaknesses cold 10

Explosion (fire) When the firewyrm dies, it explodes, dealing 6d6 fire damage to each creature in a 10-foot emanation (DC 28 basic Reflex save).

Intense Heat (aura, fire) 10 feet, 4d6 fire, DC 25 basic Reflex.

Speed 60 feet

Melee [>] tail +20 (reach 15 feet), Damage 2d8+11 fire plus 2d8 persistent fire

Ranged [>] fire mote +20 (range increment 60 feet), Damage 2d8+6 fire

Breath Weapon [>>] (evocation, fire, primal) The firewyrm breathes a 30-foot cone of fire dealing 7d6 fire and 2d8 persistent fire damage to every creature within the cone (DC 28 basic Reflex save). The firewyrm can't use Breath Weapon again for 1d4 rounds.

Bestiary, page 149. Expanded in LOIL.