Shield

Level & School 1st-level abjuration
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
Classes Sorcerer, Wizard

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.