The Hollow Knight, also known as the "Pure Vessel", “Sealed Vessel”, or simply "the Vessel" is the chosen vessel that was given the task to seal the Infection and the Radiance. As the Pale King saw the Hollow Knight to be pure, it was raised in the kingdom and was used as seal for the Radiance once it was fully-grown. He is calm, cold, and doesn’t have any feelings, just loyalty to his king.