Elemental Mage Armor

You touch a willing creature who isn't wearing armor, and a protective magical force surrounds it until the spell ends. The target's base AC becomes 14 + its Dexterity modifier. The spell ends if the target dons armor or if you dismiss the spell as an action.

In addition, You have resistance to the element of your choosing of either fire, cold, acid, thunder, or lightning damage for the duration of the spell. Recasting this spell will allow the user to reselect a different resisted element.