Weaponize Life

Six darts of necrotic energy seep from your body dealing 5 points of necrotic damage to yourself, which can't be reduced in any way. If you drop to 0 hit points, you die instantly and your body disintegrates. You can be restored to life only by means of a true resurrection or a wish spell. If you take damage as part of the cost of casting this spell that would bring you below 0 hit points, you double the darts created.

Each dart hits a creature of your choice that you can see within range. A dart deals 1d4+2 necrotic damage 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 two more darts for each spell slot level above 2.