Blade of Blood

This spell feeds on your life force and infuses the weapon touched with baleful energy. This spell deals 5 necrotic damage to you when you cast it. The next time this weapon strikes a living creature, blade of blood discharges and deals an extra 3d6 points of necrotic.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage done to you increases by 5 and the damage dealt by the attack increases by 2d6 for each slot.