You conjure a jolly, happy elemental, with a corn cob pipe and a button nose, and two eyes made out of coal, to fight as your ally or perform tasks for you. It manifests in an unoccupied space that you can see within range. This corporeal form uses the Frosty Companion stat block. The creature disappears when it drops to 0 hit points or when the spell ends.
When you cast the spell in snowy terrain or with actual snow or no magical frozen water as a focus, you gain a bonus to any saving throw made to maintain concentration on it equal to the level at which you cast the spell. If you can the spell on an already existing inanimate snowman, you have advantage on any saving throw made to maintain concentration on the spell. The creature disappears when it drops to 0 hit points or when the spell ends.
The creature is an ally to you and your companions. In combat, the creature shares your initiative count, but it takes its turn immediately after yours. It obeys your verbal commands (no action required by you). If you don’t issue any, it takes the Dodge action and uses its move to avoid danger.
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, use the higher level wherever the spell’s level appears in the stat block.
Frosty Companion
Medium elemental
Armor Class 11 + the level of the spell (natural armor)
Hit Points 50 + 10 for each spell level above 4th
Speed 40 ft.; burrow & climb 40 ft. (snow only)
Damage Resistances cold
Damage Immunities poison
Damage Vulnerabilities fire
Condition Immunities exhaustion, paralyzed, petrified, poisoned, unconscious
Senses darkvision 60 ft., passive Perception 10
Languages Primordial, understands the languages you speak
Challenge — Proficiency Bonus equals your bonus
Made of Snow, as the Children Know. The snowman can move through a space as narrow as 4 inches wide (snowball sized) without squeezing. It also can move through and around and occupy other creatures and objects space provided there is uninterrupted snow or ice in a path to do so (ex, under a creatures legs, up an icicle to a roof)
Actions
Multiattack. The elemental makes a number of slam attacks equal to half this spell’s level (rounded down). Or it makes one Frosty Breath or Snowball Barrage attack.
Slam. Melee Weapon Attack: your spell attack modifier to hit, reach 5 ft., one target. Hit: 1d10 + 4 + the spell’s level bludgeoning damage.
Frosty Breath. The snowman exhales hard. Each creature in a 15 ft cone originating from it must succeed on a Constitution saving throw against your spell save DC or take 2d8 + the spells level cold damage.
Snowball Barrage. The snowman uses his arms as literal catapults for shittons of snowballs. Each creature in 10ft radius sphere centered on a point the snowman can see within 30 ft must succeed on a Constitution saving throw against your spell save DC or take [half this spell’s level (rounded down)]d6 cold damage and [half this spell’s level (rounded down)]d6d6 bludgeoning damage.(that's 2d6 and 2d6 for a regular 4th level casting)
The jolly snowman, ready to paste the next donkey to eat it's nose!
Keeping cold damage only to resistant is quite kind of the OP. I would have made it immune. And added in resistance to piercing and slashing but vulnerable to bludgeoning.
Amazing start though. Huge vote up. I'm just mean and would love to make Frosty the Frozen Abomination.
It actually kind of makes sense to keep it as resistance, because if snow freezes fully into ice it's going to be a lot less malleable. Technically it would really require both heat and cold (to melt then refreeze) but I think it's justifiable mechanically.
I could homebrew a abominable snowman spell.