Shadow Drain

You siphon away the vitality and sense of self through the shadows of nearby creatures in a 15-foot Emanation originating from you.

When you cast this spell, you can designate creatures to be unaffected by it. Whenever any other creature enters the Emanation or starts its turn there, or when the Emanation enters a creature’s space, the creature must make a Charisma saving throw. On a failed save, the creature takes 2d6 Necrotic damage and has Disadvantage on attack rolls and ability checks until the end of its next turn. On a successful save, the creature takes half as much damage only. A creature makes this save only once per turn.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.