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A long-vanished Goddess who is itemised by the Extremely Senior Postman Anghammarad as a thing to fear, and which may strive to prevent the Message from being delivered.

Also see Mrs Cake.

As Czol is invoked in the context in which the modern Post Office places Mrs Cake, it is possible there may be an association, or at least a resonance down the millenia. Anghammarad might have told more, but his comment on Czol is a flat "Don't Ask".