uncommon ln large amphibious dragon elemental water 

Perception +16; darkvision, scent (imprecise) 60 feet

Languages Aquan, Common, Draconic

Skills Acrobatics +14, Athletics +18, Deception +18, Intimidation +18, Nature +16, Society +16, Survival +14

Str +6 Dex +2 Con +4 Int +2 Wis +2 Cha +4

AC  27; Fort +18, Ref +16, Will +16

HP 142; Immunities acid, paralyzed, sleep

Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 24

Brine Spit [R] Trigger A creature the brine dragon observes within 30 feet uses a concentrate action; Effect The dragon spits a glob of caustic salt water at the creature. The creature takes 3d6 acid damage (DC 26 basic Reflex save). On a failure, the concentrate action is disrupted.

Speed 30 feet, fly 100 feet, swim 50 feet

Melee [>] jaws +20 (acid, reach 10 feet), Damage 2d10+8 piercing plus 2d4 acid

Melee [>] claw +20 (agile), Damage 2d8+8 slashing

Melee [>] tail +18 (reach 15 feet), Damage 2d12+8 bludgeoning

Melee [>] wing +18 (agile, reach 10 feet), Damage 1d12+8 piercing

Primal Innate Spells DC 26, attack +18; 2nd obscuring mist; 1st hydraulic push (×2)

Breath Weapon [>>] (acid, evocation, primal) The dragon breathes a spray of acidic salt water that deals 9d6 acid damage in an 80-foot line (DC 26 basic Reflex save). They can't use Breath Weapon again for 1d4 rounds.

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

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

Bestiary 2, page 87.