Blood Draw

You conjure trailing red motes that fill a 15ft radius sphere within range. All creatures in that sphere must make Constitution saving throws. On a failed save, the creatures begin bleeding profusely as their blood is unable to coagulate. Every time the creature loses hit points to bludgeoning, piercing, or slashing damage, they take an additional 1d6 damage from the attack. 

At higher levels. When you cast this spell using a spell slot of 3rd level or higher, the additional damage gained increases by 1d6 for each slot level above 2nd.