Arctic Sky Guardian

Keen Hearing and Smell. The Guardian has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Power of Storms The Guardian can absorb the power of a thunderstorm and turn it into pure strength, allowing it to cast the spell Lightning Bolt at 5th level.

Snow Camouflage. The Guardian has advantage on Dexterity (Stealth) checks made to hide in snowy terrain.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Cold Breath/Lightning Breath (Recharge 5–6). The Guardian exhales a blast of freezing wind/Lightning in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 18 (4d8) cold/lightning damage on a failed save, or half as much damage on a successful one.