uncommon lg gargantuan amphibious dragon water 

Perception +32; darkvision, scent (imprecise) 100 feet

Languages Aquan, Common, Draconic, Dwarven, Elven, Gnomish; speak with animals

Skills Acrobatics +28, Arcana +35, Athletics +34, Diplomacy +32, Intimidation +32, Occultism +33, Society +33, Stealth +28

Str +8 Dex +4 Con +6 Int +7 Wis +6 Cha +6

AC  43; Fort +32, Ref +30, Will +34; +1 status to all saves vs. magic

HP 360; Immunities electricity, paralyzed, sleep

Electricity Aura (aura, electricity) 15 feet, 2d12 electricity damage. The bronze dragon can turn this aura on or off using a single action, which has the concentrate trait, and it can choose to not affect allies with the aura.

Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 38

Vortex (aura, water) 40 feet. Water in the aura that is also in the same body of water as the dragon is difficult terrain for Swimming creatures that don't have the water trait.

Attack of Opportunity [R] Jaws only.

Vortex Pull [R] (water) Trigger A creature in the dragon's vortex uses a Swim action. Effect The dragon creates a current of water, forcing the triggering creature to attempt a DC 40 Athletics check to Swim. If the creature fails, it's pulled 30 feet toward the dragon and the triggering action is lost. If it succeeds, it can Swim normally (using the result of that roll if it doesn't have a Swim speed).

Speed 60 feet, fly 200 feet, swim 60 feet

Melee [>] jaws +35 (electricity, magical, reach 20 feet), Damage 3d12+16 piercing plus 2d12 electricity

Melee [>] claw +35 (agile, magical, reach 15 feet), Damage 3d10+16 slashing

Melee [>] tail +33 (magical, reach 20 feet), Damage 2d10+14 bludgeoning

Arcane Innate Spells DC 40; 5th control water (at will); 2nd obscuring mist (at will); Constant (2nd) speak with animals

Breath Weapon [>>] The bronze dragon breathes in one of two ways. The dragon can't use Breath Weapon again for 1d4 rounds.

• Lightning (arcane, electricity, evocation); The dragon breathes lightning in a 100-foot line that deals 12d12 electricity damage (DC 40 basic Reflex save).
• Repulsion Gas (abjuration, arcane, incapacitation, mental); The dragon breathes a 100-foot line of repulsive gas. Each creature in the area must succeed at a DC 40 Will save or become fleeing from the dragon for 1 round (or 2 rounds on a critical failure).

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

Draconic Momentum When the dragon scores a critical hit with a Strike, it recharges its Breath Weapon.

Water Mastery (arcane, transmutation, water) For up to 120 minutes per day, the dragon, along with allied creatures and vessels within 50 feet, can move at double their normal Speed in water.

Bestiary, page 120.