Angelic Guardian

You conjure a minor celestial manifestation to protect a creature you can see within range. A faintly glowing figure resembling a human head and shoulder hovers within 5 feet of the target for the duration. The figure moves to interpose itself between the target and any incoming attacks, granting the target +2 to AC.

If the target fails a Dexterity saving throw while the spell is active, it can use it's reaction to roll a new save. The spell then ends.

-- From Kobold Press