Blood Weapon 2

You use your life force or any creature's blood (may be unconscious but has to be very close) to create a simple weapon that attaches to a limb. You take 4 damage (if you use your life force) to cast your weapon as a material cost. You can't let go, If you become unarmed, the weapon disappears. You can discard it as a bonus action and resorb lost health.

 At Higher Levels. When cast at higher character levels, weapon damage increases

.