Winter Domain (*work in progress)

Bonus Cantrip
When you choose this domain at 1st level, you gain the Frostbite (PotA) cantrip.

Child of Winter
Also at 1st level, you gain resistance to cold damage.  Additionally, you can tolerate temperatures as low as -50 degrees Fahrenheit without additional protection.  If you wear heavy clothes, you can tolerate temperatures as low as -100 degrees Fahernheit.

Channel Divinity:  Nip in the Air
Starting at 2nd level, you can use your Channel Divinity to radiate the numbing chill of winter, dealing cold damage to your foes and hindering their movements.
As an action, you present your holy symbol, and each hostile creature within 30 feet of you must make a Constitution saving throw.  On a failed save, a creature takes cold damage equal to 2d10 + your cleric level and its speed is reduced by 10 feet until the start of your next turn. On a successful save, the creature takes half damage, but suffers no other effect.

Winter Domain Spells
Cleric Level Spells
1st - Armor of Agathys, Ice Knife (PotA)
3rd - Slow, Snilloc's Snowball Swarm (PotA)
5th - Feign Death, Sleet Storm
7th - Blight, Ice Storm
9th - Antilife Shell, Cone of Cold

Frosty
???/snow-covered enemies (debuff)/snow coating of self (buff)/conjure snowman (utility)

Potent Spellcasting
Starting at 8th level, you add your Wisdom modifier to the damage you deal with any cleric cantrip.

Frigid Body
Each hostile creature within 10 feet of you cannot take reactions.