You concentrate negative energy on yourself and a necrotic wave erupts from you. Each creature of your choice within range must succeed on a Constitution saving throw or take 1d4 necrotic damage, and it can't take reactions until the start of its next turn.

The spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).