Armor of Elemental Ice - Elemental Armor

You create plate armor made of unmelting ice around a humanoid creature you touch. Anyone who hits with a nonspell attack must succeed on a CON saving throw or take 2d4 cold damage on a failed save or half as much damage on a successful one. Besides the AC bonus, the armor gives the wearer immunity to cold damage. It has an AC (while unworn) of 20, immunity to poison, psychic, and cold damage, and vulnerability to fire. It has 25 hit points and melts after 1d6+1 hours unworn in non-arctic weather.

At higher levels. The cold damage increases by 1d4 for each spell level above 2nd.

Armor of Elemental Air, Armor of Elemental Fire, Armor of Elemental Earth, Armor of Elemental Water, and Armor of Elemental Ice are one spell for the purpose of preparing, called Elemental Armor.  I apologize for not making them a single spell from the beginning.