Caroline's Impulse Multiplier

When you cast this spell, you can alter the momentum of a projectile. When you see a physical projectile in range (eg. arrow, javelin, etc.), you can cast this spell to either add or subtract two damage dice from the attack. When you add damage dice, roll them and add them to the total. When you subtract damage dice, do the same and subtract them from the total. If you add damage to a critical hit, double the value rolled. When you subtract damage from a critical hit, do not double the value rolled. 

This only applies to the physical damage of the attack, not elemental damage types (eg. fire, poison). 

This spell may not be used on magically created and/or energy projectiles. E.g. Magic Missile, Eldritch Blast, and Fire Bolt can not be affected by this spell.

At Higher Levels. For every level above first, you can add or subtract one extra damage die.