Blood rush

As a bonus action you take 1d4 radiant or necrotic damage by casting this spell, than three darts of blood spring from your wounds. Each dart strikes a creature of your choice that you can see within range. A dart deals damage equle to half the damage you've taken since your last turn to its target. The darts all strike simultaneously, and you can direct them to hit one creature or several.

Using a Higher-Level Spell Slot. The spell creates one more dart for each spell slot level above 1.