Source: Player’s Handbook
Level 1 Abjuration (Sorcerer, Wizard)
Casting Time: Reaction, which you take when you are hit by an attack roll or targeted by the Magic Missile spell Range: Self Components: V, S Duration: 1 round
An imperceptible barrier of magical force protects you. Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from Magic Missile.