Casting Time: 1 action
Components: V, S, M (a miniature cloak)
Duration: Concentration, up to 1 minute
You touch one willing creature. Once before the spell ends, the target can roll a d4 and add the number rolled to one saving throw of its choice. It can roll the die before or after making the saving throw. The spell then ends.
You can find more information on this spell in: PHB.272