Crucio

You recite the incantation Crucio with evil intent. Target creature must make a DC - Constitution Saving Throw Success Target take half Damage or be knocked prone and take 4d6 Necrotic damage, the creature must make the Saving Throw again at the end of each of their turns or takes the damage again. 

Using a Higher-Level Spell Slot. You can target one additional Humanoid for each spell slot level above 1.