Warm Body

You touch a willing creature that isn't an undead or a construct and infuse its body with a surge of warmth. The creature gains temporary hit points equal to your spellcasting ability modifier + your level (minimum of 1) and gains resistance to cold damage for the duration. Additionally, the creature has advantage on saving throws against spells and effects that deal cold damage, and isn't affected by difficult terrain caused by snow or ice.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the temporary hit points gained increase by 4 for every slot level above 2nd.