As a reaction, which you use when you or another creature that you can touch or see within 10 meters makes an attack roll, an ability check, or a saving throw, the creature gains divine conviction. Roll a d4 and add the result to the creature’s roll. You can do so after the creature rolls but before any effects of the roll occur.
You can expend 2 additional mana to roll 2d4.
You can expend 4 additional mana to roll 3d4.