Blood to Bone

Using accursed knowledge of bodies both living and dead. You use pure necromantic energy to calcify a target's blood transforming it into bone.  You target one creature of which you have a bone type. Ie humanoid bone for humanoids, beast bones for beasts, etc (If the target does not have blood or bones they are immune to the paralysis effect). As you chant the incantation and pour the vial of blood over the bone your target must make a Constitution saving through against your spell save Dc. On a failed save the blood in their veins quickly turns to bone. The target suffers 2d10 Necrotic damage and is paralyzed for the duration. On a successful save the target takes half damage and is not paralyzed. a Target that succeeds in its saving throw can not be the target of this spell again for 24 hours.