Freezing Smite and Sacrifice
A double whammy this time, not only a new spell for your paladins, but showing off a new Method of Worship for the priest to go with it!
Freezing Smite is, as you can probably guess, a new Paladin spell for your 5e games. While there's already plenty of different damage types represented in smite spells: thunder, fire, and psychic twice to name a few, there's not yet an official cold based smite spell.
Freezing Smite exists to fill that void, while it deals less damage than even some first level smites, the extra effects are where it becomes really useful, speed reduction and loss of reaction is extremely useful, helping your allies get away from enemies and not being chased down, or not having to worry about getting counterspelled this round for example.
Where this becomes really interesting though is when we look at the next new method of worship The Priest Class will be getting next update: Sacrifice
As with all of Priest's Methods of Worship, at first level this grants the priest a new spellcasting focus: a knife or weapon that deals slashing damage, requiring you to wave the weapon as you cast spells; and an improvement to some spells, in this case, smites.
If a priest hits a creature with a weapon attack, they can choose to cast a smite spell as part of that attack (much like Paladins do with their Divine Smite feature), this can be any smite spell that priests know, which will of course be all official smite spells. A feature stolen with permission from heavily inspired by @cardstockcaster's conviction paladin optional class feature.
Priests aren't the best in melee combat usually, not having very good weapon proficiencies for it, but combined with War as your Deity's Domain, or Judge as your Divine Calling, both of which grant you proficiency in all Melee Weapons, a Priest can become a monster in the front lines, smiting foes left and right in a way paladins could only dream of.
Keep your eyes peeled for the level 1-13 Priest Class playtest, featuring Freezing Smite, and Sacrifice, coming very soon!