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The Cloister Bell was an alarm bell, located in the Cloister Room inside a TARDIS.
It went off when the Master cannibalized The Doctor's TARDIS into a Paradox Machine.
When the Cloister Bell tolled, it sounded like a big church bell. (DW: Logopolis)
In Attack of the Graske the cloister bell sounded along with a light on the Console as a warning to an approaching teleport.
