Bound Blood Weapon

You mold the blood into a weapon of your choice. You become proficient with it and the damage for the weapon becomes a D6 (Increases with spell level)

If you loose touch with it then it must be dispelled or you must concentrate on this spell until you touch it again.

Whenever you take damage that causes you to loose blood: Roll a D20, on a 1; your weapon is dismissed.

As an action, you can temporarily dismiss your weapon. It disappears into a blood stream. Alternatively, you can dismiss it forever. As an action while it is temporarily dismissed, you can cause it to reappear from that creatures blood.
You can’t have more than one weapon at a time. If you cast this spell while you already have a weapon, you instead cause it to adopt a new form.