Source: System Reference Document 5.0
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Classes: Sorcerer, Wizard

Classification: 1st-level Abjuration

Casting Time: 1 reaction, which you take when you are hit by an attack or targeted by the magic missile spell

Range: Self

Components: V, S

Duration: 1 round

Saving Throw: None

An invisible barrier of magical force appears and 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.