Bloodletting Lash

You create a whip of blood that lashes out at a creature within range. Make a melee spell attack against a creature. On a hit, the target takes 1d8 slashing and 1d6 necrotic damage, and its movement speed is halved until the end of your next turn. As a bonus action on subsequent turns, you can lash again while the spell persists.

At Higher Levels. Damage increases by 1d6 necrotic for every two levels above 1st.