Cheer Domain

The Cheer domain focuses on bringing holiday cheer to all, especially during cold and harsh winters. The gods of this domain cherish the joy and spirit of the holiday season, gathering close together with family and loved ones, and the importance of giving, especially to those who most deserve it. The most famous deity of this domain is of course Saint Nicholas (also known as Santa Clause, Father Yuletide, or Kris Kringle) although there may be other good aligned deities that could be associated with this domain. Clerics of cheer are devoted to spreading the loving warmth of the holiday season, using the power of their gods' omniscience, they determine who is deserving of rewards based on good behavior. 

Cheer Domain Spells

Cleric Level         Spells

1st                        goodberry, sanctuary

3rd                        calm emotions, pass without a trace

5th                         beacon of hope, sleet storm

7th                         divination, fabricate 

9th                         cone of cold, passwall

Bonus Cantrip

When you choose this domain at 1st level, you gain one additional cantrip of your choice from the following options: mending, guidance, or ray of frost. 

Blessing of Cheer

Also at 1st level, you can use your action to fill your allies with holiday cheer. You choose any number of willing creatures within 30 feet of you (this can include yourself) equal to your proficiency bonus. While filled with holiday cheer you gain advantage against being frightened and resistance to cold damage. This blessing lasts for 10 minutes or until you use this feature again.

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Channel Divinity: Naughty or Nice

Starting at 2nd level, you can use your Channel Divinity to help you know the true heart of a person. 

As an action, you present your holy symbol and evoke the all knowing power of Saint Nicholas. This grants you the ability of the detect thoughts spell and lasts for 1 minute. Additionally, thanks to the guidance of Saint Nicholas, while using this ability you can tell when a creature within 30 feet of you is lying. 

Reindeer Games

Starting at 6th level, you gain the ability to use the Find Steed spell.

You must use one of your Cleric spell slots to cast this spell, and it counts as a Cleric spell for you. The steed that you summon will be one of Santa's flying reindeer. The steed you summon can only come in this form. The reindeer will have the stat block of Santa's Reindeer.

https://www.dndbeyond.com/monsters/1981257-santas-reindeer

Potent Spellcasting

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

Merry and Bright

Starting at 17th level, your ability to spread Christmas cheer increases. Any creature affected by your Blessing of Cheer ability is in such good cheer that they can now add your proficiency bonus to any Saving Throw including Death Saving Throws.

Additionally, you gain immunity to the Frightened condition.