Blood sword

You control your very body to create a magical weapon from your very blood. This magic sword lasts until the spell ends. It counts as a simple melee weapon with which you are proficient. It deals 2d8 necrotic damage on a hit and has the finesse, light, and thrown properties (range 20/60). 

If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the sword to reappear in your hand.

At Higher Levels. When you cast this spell using a 4rd- or 5th-level spell slot, the damage increases to 4d8. When you cast it using a 5th- or 6th-level spell slot, the damage increases to 5d8. When you cast it using a spell slot of 7th level or higher, the damage increases to 6d8.