uncommon lg gargantuan cold dragon 

Perception +32; darkvision, fog vision, scent (imprecise) 60 feet

Languages Auran, Common, Draconic, Dwarven, Sylvan

Skills Acrobatics +27, Athletics +38, Diplomacy +34, Intimidation +37, Medicine +33, Religion +32, Society +30

Str +9 Dex +4 Con +5 Int +5 Wis +5 Cha +7

Fog Vision The silver dragon ignores the concealed condition from fog and clouds.

AC  45; Fort +34, Ref +31, Will +34; +1 status to all saves vs. magic

HP 410; Immunities cold, paralyzed, sleep; Weaknesses fire 15

Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 40

Cold Aura (cold, aura) 15 feet, 3d6 cold damage. The silver dragon can turn this aura on or off as a single action, which has the concentrate trait, and can choose not to affect allies within the aura.

Reflect Spell [R] Trigger The silver dragon critically succeeds at a saving throw against a spell, or a caster trying to target the dragon critically fails their attack roll. Effect The spell is reflected back upon the caster, with the effect of spell turning.

Wing Deflection [R] Trigger The silver dragon is targeted with an attack. Effect The dragon raises its wing, gaining a +2 circumstance bonus to AC against the triggering attack. If the dragon is flying, it descends 10 feet after the attack is complete.

Speed 60 feet, fly 180 feet; cloud walk

Melee [>] jaws +37 (cold, magical, reach 20 feet), Damage 4d10+17 piercing plus 4d6 cold

Melee [>] claw +37 (agile, magical, reach 15 feet), Damage 4d8+17 slashing

Melee [>] tail +35 (magical, reach 25 feet), Damage 3d10+15 bludgeoning

Arcane Innate Spells DC 40; 1st detect alignment (evil only)

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

• Frost (arcane, cold, evocation); The dragon breathes a cloud of frost in a 50-foot cone that deals 20d6 cold damage (DC 42 basic Reflex save).
• Paralyzing Gas (arcane, enchantment, incapacitation); The dragon breathes a blast of paralyzing gas. Each creature within a 50-foot cone must succeed at a DC 42 Fortitude save or be paralyzed for 1 round (or 3 rounds on a critical failure).

Cloud Walk The silver dragon can tread on clouds or fog as though on solid ground.

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

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

Bestiary, page 127.