Bone Blade

You wrap necromantic energy around the bone used for the material component to cast this spell causing it to change into a shortsword, rapier, longsword or greatsword made of sharpened bone. You become proficient with this weapon for the duration of this spell. This weapon uses your spell attack modifier for attack and damage rolls, has a +1 to attack and damage rolls made with it and deals an extra 1d6 necrotic damage to all creatures except constructs and undead and deals an extra 2d6 necrotic damage to celestials.