We have mass cure, so why not mass hurt!
Mass Inflict Wounds
Casting Time: 1 action
Range: 30 feet
Components: V, S
You drain the life from an area in range. Choose up to six creatures in a 30-foot-radius sphere centered on that point.
On a failed Wisdom saving throw, each target takes 6d8 necrotic damage. This spell has no effect on constructs and undead.
At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, increases the damage by 1d8 for each slot level above 5th.