From Dungeons and Dragons Wiki
|This material from the 5th edition SRD is published under the OGL|
Shield is a spell in 5th edition.
|Casting Time:||1 reaction, which you take when you are hit by an attack or targeted by the magic missile spell.|
|Casters:||Eldritch Knight, Sorcerer, Wizard|
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.