Mage Armor

From Player's Handbook, page 256.

Description
1st-level abjuration


 * Casting Time: 1 action
 * Range: Touch
 * Components: V, S, M (a piece of cured leather)
 * Duration: 8 hours

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.

Learned By

 * Classes: Sorcerer, Wizard
 * Subclasses: Fighter (Eldritch Knight), Rogue (Arcane Trickster), Sorcerer (Clockwork Soul)
 * Eldritch Invocations: Armor of Shadows
 * Races: Mark of Warding Dwarf
 * Feats: Magic Initiate, Strixhaven Initiate