Blood Blade

You can conjure or coat a blade with solid blood. This effect creates a one-handed blade that possesses the light, and thrown property(20/60)

For the duration of the spell, the weapon's damage die deals 2d4 necrotic damage. If you drop the weapon or throw it, it melts into a pile of blood at the end of the turn. Bleeding creatures take an additional 1d4 necrotic damage. 

Thereafter, while the spell persists, you can use an action to cause the blade to reappear in your hand. Wielding this weapon, you can use your spellcasting modifier instead of your Strength or Dexterity modifier for your attack and damage rolls.

You can choose to take 1 damage to increase the weapon's damage die to 3d4 for the duration of the spell.