Source: Player's Handbook
1st-level abjuration
Casting Time:
1 bonus action
Range:
60 feet
Components:
V, S, M (a small parchment with a bit of holy text written on it)
Duration:
Concentration, up to 10 minutes
A shimmering field appears and surrounds a creature of your choice within range, granting it a +2 bonus to AC for the duration.