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 13 + its Dexterity modifier. The spell ends if the target dons armor or if you dismiss the spell as an action.

You touch a willing creature who isn’t wearing armor. Until the spell ends, the target’s base AC becomes 13 plus its Dexterity modifier. The spell ends early if the target dons armor.