Armor Class 17 (natural armor)
Hit Points 133 (14d10 + 56)
Speed 40 ft., fly 80 ft., swim 40 ft., burrow 20 ft.
Saving Throws DEX +3, CON +7, WIS +3, CHA +4
Skills Perception +6, Stealth +3
Damage Immunities cold
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 16
Languages Common, Draconic
Challenge 6
Ice Walk. The dragon can move across and climb icy surfaces without needing to make an ability check. Additionally, 3 composed of ice or snow doesn't cost it extra movement.
Multiattack. The dragon makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 4 (1d8) cold damage.
Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
Cold Breath (Recharge 5–6). The dragon exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 15 Constitution saving throw, taking 45 (10d8) cold damage on a failed save, or half as much damage on a successful one.
Monster Manual (2014), p. 101