As a reaction, which you use when you make an attack roll, an ability check, or a saving throw, reflections of yourself swarm about you, whispering suggestions. Roll a d4 and add the result as a bonus to the roll. You can do so after the roll but before any effects of the roll occur.
You can expend 2 additional mana or psi to roll 2d4.
You can expend 4 additional mana or psi to roll 3d4.