Shield

Spell Lists: Wizard, Sorcerer
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

An invisible barrier of magical force appears and protects you. Until the start of your next turn, you have a +1 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the bonus to ac increases by 1 for each slot level above 1st.