Shield

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 +5 bonus to AC, including against the
triggering attack, and you take no damage from
magic missile.