Animating Bite

You can suffuse your unholy lifeforce into creatures you drain. When you reduce a creature to 0 hit points you can choose to animate it, causing it to rise at the next midnight as a zombie under your control. This zombie can take simple commands from you and you may have a number of zombies equal to your proficiency bonus under your control through this method at a time. If you already have your maximum number of zombies under your control other corpses which rise due to your bite are not under your control are hostile towards you and others.

Level 18 - Your bite may raise vampire spawns instead of zombies. You may have up to one vampire spawn under your control through this method at any time.

Level 20 - You may have a number of zombies under your control equal to double your proficiency bonus and you can now control 2 vampire spawn.