Blood Blade

Breaking the phial of blood siphons a solid crimson blade into your grip. While you hold this dagger you are considered proficient and deal 1d6 piercing damage as well as 1d6 necrotic damage with it. You make attack rolls with this blade at advantage if the target is missing more than half its hit points. When you hit a creature with the blade you regain hit points equal to the necrotic damage rolled. All of the weapon's damage is considered magical for the purpose of overcoming resistance to non-magical attacks. The blade vanishes and the spell ends if it ever leaves your grip.

original spell by B. Lamper