Brother William

Before taking the vow and devoting himself to the "opus dei", brother William had been making his living by bashing heads for money, e.g. as a mercenary.
Now that he'd learned that there were other methods to make people do what you wanted, most of which involved promises of divine punishment in one way or another, he almost gave up violence.
But the old habits die hard, and so he had volunteered to guard the abbey at night. Curiously, no sane man had attempted to rob it ever since...

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inspired by Umberto Eco and Terry Pratchett books, and Assassins Creed 2  ; )