Blood Soaked Weapon

You channel arcane energy into the weapon you’re holding, and choose one damage type: acid, cold, fire, lightning, poison, or thunder. If the attack hits you deal an extra 3d6 damage of the chosen type to any target you hit with the weapon. If the weapon isn’t magical, it becomes a magic weapon for the spell’s duration.

You may take 5 HP of Slashing Damage to yourself; if you do so you may cast Blood Soaked Weapon without expending a spell slot.