Brittany's parent were supporters of the crusade against the Worldwound. When she was 5 years old she was kidnapped by cultists, in order to blackmail her parents. As her parents tried to rescue her they were murdered by the demons the cultists worshiped. With her parents dead the cultist thought to put the girl to use for some other purpose. They decided to make her the guinea pig for their demonic experiments. She was only rescued when a Paladin of Iomedae found executed the cultists. Her parents being faith worshipers of Irori she was sent to be raised at an all female Temple.
There she was taught to train her body and mind to self perfection. She was able to take this much of this training and excelled beyond all of her counter parts except in one area. She deeply internalized the idea of perfection and was relentless in her pursuits. However she was never quite able to stretch the concept to its fullest. By this it is meant that she never able to let go. Never able to quell the driving fury within herself, this led her away from a more than basic understanding of the spiritual aspects. She instead became more dogmatic and intent on making physical changes to push herself and others toward perfection. At the age of 15 she became one of the temples best teachers of the physical aspects of the martial arts.
However, the fury building in her was never quite satisfied and she longed to have vengeance against the demons. So she requested permission to go to the Worldwound and help fight the demons, but the abbot refused saying "this will neither sooth your soul nor bring you closer to perfection" suggesting instead that she help bring the teachings of Irori to the outside world. So she requested permission to preach in the street about the ways of Irori, his truth and light. So 5 days a week she would go out into the street and perform feats of strength and stamina, and how Irori's teaching had allowed her to develop the ability to achieved such things. One day while explaining the search for self perfection to a Knight on the street, she was called out. The knight said sarcastically "If you want to go spread the good word why don't you go to Kenabres. There are none of your kind there." After investigating this comment and finding it to be true, Brittany asked the abbet of her temple to allow her to under take the journey.