Agoraphobia

Agoraphobia is a psychological condition. The sufferer is afraid of open spaces and the outside, to the point where they cannot leave their own home.

Alistair Gryffen began suffering from it following the loss of his wife and children. (K9TV: The Fall of the House of Gryffen) He eventually overcame his condition in order to shut down the Space-Time Manipulator. (K9TV: The Eclipse of the Korven)