Arterial Arsenal

You cut open the palm of your hand to draw out your blood and shape it into a weapon of your choice. The weapon can take the form and properties of any simple or martial weapon that lack the Heavy,  Loading or Special properties. You have proficiency with the weapon regardless of the form and it deals extra Necrotic damage equal to your spellcasting ability modifier. If the weapon has the Ammunition property you create one piece of ammunition along with the weapon. You take necrotic damage equal to the weight of any summoned weapon and ammunition in lbs (minimum of 1), which can't be reduced in any way.

If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to create another weapon or piece of ammunition, taking the required damage.

At Higher Levels. When you cast this spell using a 3rd- or 4th-level spell slot, the weapon gains a +1 bonus to attack and damage rolls. When you cast it using a 5th- or 6th-level spell slot, the bonus increases to a +2. When you cast it using a spell slot of 7th level or higher, the bonus increases to a +3.