Blood Blade

You are able to conjure a jagged blade of solid blood. This effects 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 deal 2D4 necrotic damage. If you drop the weapon or throw it, it melts into a pool of blood at the end of the turn.

Thereafter, while the spell persists, you can use a bonus action to cause the blade to reappear in your hand. 

While 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 spend one hit die to increase the weapon's damage die to 3D4 for the duration of the spell.