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 it if the target dons armor or if you dismiss the spell as an action.

1st level abjuration
 * Casting Time: 1 action
 * Range: Touch
 * Components: V S M (A piece of cured leather)
 * Duration: 8 hours
 * Classes: Sorcerer, Wizard