As an action, a flash of light streaks toward a creature within 20 meters. Make a ranged spell attack against the target.
On a hit, it takes 3d12 radiant damage and mystical dim light glitters on it, causing the next attack made against it to have advantage if it is made before the end of your next turn.
On a critical hit, it takes twice as much damage.
On a miss by 4 or less, it takes half as much damage.
You can increase the damage by 3d12 for each additional mana expended.