Bolts of Pain

Make them hurt, grant them pain, for every injustice. Leave no sin unpunished.

You expel three lacerating bolts of crimson from the various wounds on your body to strike with baleful retribution. For each bolt, you make a separate spell attack roll, dealing 2d4 piercing damage on a hit. Each bolt has advantage to hit a creature who has dealt damage to you within the last round, and if they hit, they take an additional 2d4 necrotic damage. 
You gain 1d4 temporary hit points for each creature reduced to 0 hit points in this manner, which is calculated once the spell ends.

At Higher Levels:
When cast at 4th level or higher, you unleash one additional bolt for each level cast above 3rd.