Wrack

You unleash a wave of crippling pain at a creature within range. The target must make a Constitution saving throw or take 1d8 necrotic damage, and it is unable to take the dash action until the end of it's next turn.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).