Blood Tax

Once per day, when you make an attack with a weapon that deals piercing damage, if the attack hits, you can choose to exact a blood tax from the target you hit with the attack. Make four additional attacks against that creature on a hit. The first strike deals an additional 2d6 damage and an extra 2d6 necrotic damage on a hit. The second and third deal an additional 1d6 damage and 1d6 necrotic damage each on a hit. The fourth deals an additional 2d6 damage and an extra 2d6 necrotic damage on a hit. For each of these attacks that hit, you regain 1d6 hit points and gain 1d4 temporary hit points.