Blood Lash

You cause yourself to sprout long whips of blood from your wrists that stay for an hour or until you take an action to retract them back into your body.

The blood whips require a melee spell attack to attack with them, have a reach of 10ft and deal 3d10 necrotic damage. If a creature is damaged by a blood whip they cannot regain hit points until the start of your next turn. Whenever you make an attack with a blood whip you may do so once more as part of the same action.

This is a Sanguimancy Spell

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you deal 1 additional d10 necrotic damage for each slot level above 3rd.