Grudge Bearer. The Commoner has advantage on intelligence Checks made to Recall information about Creatures they've Encountered, as well as Wisdom (Survival) Checks made to Track them.

Ice Walk. The Commoner can move across and Climb Icy surfaces without making an an ability Check, additionally difficult Terrain made of Ice or Snow Doesn't cost them Extra Movement.

Club. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4+1) bludgeoning damage.

Freezing Gust. The Commoner Casts Ray of Frost (Charisma is it's Spellcasting Ability).

Breath Weapon (1/Day). The Dragonborn Forces all Creatures in a 15 ft Cone to make a DC 10 Constitution Saving throw or take 7 (2d6) Cold damage.