Shield
Casting Time
Range
Components:
Duration:
1 round
Casting Time: 1 reaction, which you take when you are hit by an attack or targeted by the magic missile spell
You create a shimmering arcane barrier between yourself and an oncoming attack. Until the spell ends, you gain a +5 bonus to your AC (including against the triggering attack) and any magic missile targeting you is harmlessly deflected.
Source