Squib's Palsy is a very rare disease found among wizards. It results in sporadic, temporary loss of magical ability during times of stress. It is a life long ailment, but behaves very randomly. One cannot predict how and when one's magical skill will be affected. The disease is hereditary, but a vacine does exist. However, this vacine is extremely costly to produce, and has been kept a secret by the Department of Magical Affairs.