On the bell tower
The bell tower of Monk Isle, by way of an apparent enchantment, announces to the Xenkan Monks when their next task of the day is about to commence. The monks' scriptures predicted that all three bells upon the tower would ring to herald the impending return of Xenka, their founder and prophet. The bells can be manually tolled, however the monks are able to discern the difference from their natural chiming.
In Ultima VII Part Two, the three bells rang when Xenka returned to aid the Avatar in the quest against the Guardian.