Elemental Mage Armor

This is a spell that can only be cast upon yourself when you're not wearing any armor. Until the spell ends, your AC becomes 14 plus your Dexterity modifier. The spell ends early if you don any sort of armor.

In addition to a boost in your armor class, you give yourself resistance to an element of your choosing (fire, cold, acid, thunder, or lightning) for the duration of the spell.  Should anyone physically touch you while you are wearing this armor, they will suffer 1d6 damage of the type of element you chose, per round.  Your environment will react to this armor, such as setting flammable things on fire.  Anything you are wearing or holding is not affected.