Circle of Frost

Circle of Frost druid find great beauty in snow and frost, drawing inspiration from them. A Circle of Frost druid may be inclined to be solitary, as a cold aura seems to surround them wherever they go. They view warmth and heat, as a nuissance, preventing the artic chill to fill the land. As such they despise the warmer parts of the year, and relish the colder ones.

Chilling Rime

At 2nd level you are surrounded by a chilling wind. When a hostile creature starts its turn within 5ft of you, they must make a constitution saving throw equal to your spell save DC. On a failure their movement speed is reduced by 10ft and they cannot use their reaction until the beggining of your next turn.

Icicle Creation

Also at 2nd level, If you have a free hand you can create an icicle in it. It counts as a simple weapon that you are proficient with. It has a melee range of 5ft and a thrown range of 30/60 ft. You can attack with it as a bonus action, and on a hit it deals 1d6 slashing + 1d4 cold damage when you make a melee attack with it, and when thrown the slashing damage is replaced with piercing damage. The icicle lasts for a number of attacks equal to your proficiency bonus, or until you throw it.

Permanent Cold

Starting at 6th level, you gain resistance to cold damage. In addition you can make a reaction attack with an icicle against a creature that hits you, granted that you have an icicle created.

Barrage of Icicles

Starting at 10th level, once per long rest you may create a number of icicles equal to your proficiency bonus and throw them at a creature within the normal range of your icicles. You can throw all of them at one creature of choose to throw any number at different creatures. In addition, your icicles now do 2d6 slashing/piercing and 2d4 cold damage.

Blizzard

Starting at 14th level, when you activate your wild shape, or choose to do this as action, you designate an area within 90 feet that you can see. A 20ft foot cube is filled with a blizzard starting from the point you chose. The blizzard deals 3d8 cold damage and 2d8 bludgeoning damage to anyone that starts their turn within the blizzard. It lasts for one minute, and you can use this a number of times equal to half your proficiency bonus.