Entropic Embrace

Your fingernails sharpen and drip foul ichor, ready to deliver a diseased attack. Make a melee spell attack against one creature within 5 feet of you. On a hit, the target takes 1d10 necrotic damage.
The spell’s damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).

Alternatively, you harden your muscles with necrotic energy. You may reach out with a free hand, and try to seize the target by forcing a grapple check using your spell-casting attribute. You are considered one size larger for the grapple check if the target is bloodied (under half hit-points).