uncommon ln huge amphibious dragon elemental water 

Perception +23; darkvision, scent (imprecise) 60 feet

Languages Aquan, Common, Draconic, Sylvan

Skills Acrobatics +20, Athletics +25, Deception +24, Intimidation +24, Nature +21, Society +21, Survival +21

Str +7 Dex +2 Con +5 Int +3 Wis +5 Cha +6

AC  33; Fort +25, Ref +20, Will +21

HP 222; Immunities acid, paralyzed, sleep

Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 30

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 5d6 acid damage (DC 30 basic Reflex save). On a failure, the concentrate action is disrupted.

Speed 40 feet, fly 120 feet, swim 60 feet

Melee [>] jaws +26 (acid, magical, reach 15 feet), Damage 3d10+12 piercing plus 3d4 acid

Melee [>] claw +26 (agile, magical, reach 10 feet), Damage 3d8+12 slashing

Melee [>] tail +24 (magical, reach 20 feet), Damage 3d12+12 bludgeoning

Melee [>] wing +24 (magical, reach 15 feet), Damage 1d12+12 piercing

Primal Innate Spells DC 32, attack +24; 4th hydraulic torrent; 3rd hydraulic push (×3); 2nd obscuring mist

Breath Weapon [>>] (acid, evocation, primal) The dragon breathes a spray of acidic salt water that deals 13d6 acid damage in a 100-foot line (DC 32 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.

Desiccating Bite [>>] The dragon makes a jaws Strike. On a hit, the target takes 4d6 persistent acid damage, and is sickened 2 from the pain of salt and brine in its wounds.

Bestiary 2, page 87.