Unravel Potential

You bless up to three creatures of your choice, excluding you, within range. Whenever a target makes an attack roll, ability check, or a saving throw before the spell ends, the target can roll a d8 and add the number rolled to the attack roll, ability check, or saving throw.  A target is unaffected by this spell if they are already under a similar effect from a different spell, such as the Bless spell.  When the spell ends each target must succeed on a DC 14 constitution saving throw or be stunned until the end of their next turn.