The Veil
The Veil was a clockwork construct that lived with the castle of the Doctor’s confession dial. It took the form of a woman who died when he was young, covered in white veils. She died on a hot summer day and her body attracted flies which gave the Doctor nightmares for years. The Doctor figured it was designed to force him to confess his deep dark secrets. Whenever he did, it would freeze and the castle would reconfigure itself.
Appearances
Heaven Sent (TV)