Claire-Kathryn "C.K." Piers is a character in the Charmed novel Between Worlds. She is an untrained witch picked to act as Malvolio De Vermis's medium for his own dark purposes.


Her parents died in a boating accident when she was eight years old, and her paternal grandparents took her in. They knew she was a witch, but hated her magic and taught her to hide it instead of learning to harness it.

At adulthood, she revealed her magic to her fiancé Jace Fraser, and he accepted her for who she was. She was left brokenhearted when Jace died.

She is being used by another witch to destroy the wards between the living and the dead, mainly her hidden grief, which split and became its own manifestation when she cast a spell to restore her riven heart. To save the world, C.K. learned to embrace her grief and was rewarded with the chance to see Jace one last time before he moved on.

Powers and Abilities

Basic Powers
  • Spell Casting: The ability to cast spells and perform rituals.
  • Potion Making: The ability to brew potions.
  • Scrying: The ability to locate another being with the use of a map and a crystal.
  • Mediumship: The ability to see and commune with spirits of the dead.
Active Powers
  • Psychokinesis: The ability to move objects the user cannot see. C.K. was theorized to have this power, as she mentioned being able to break windows and move objects she couldn't see whenever she got upset.


C.K. Piers appeared in a total of 1 non-canonical novel throughout the franchise.