Crimson Lash

You lash out with a whip of your own blood at a target within range. Make a melee spell attack. On a hit, the target takes 1d10 slashing damage, and you lose 2 hit points as part of the cost. If the target is below half of its maximum hit points, the spell deals an additional 1d6 necrotic damage.

Cantrip Upgrade: The dices for each roll increase by 1 and the health cost by 1 at levels 5, 11, 17.