Maybe a twist on gameplay, to terrorize the roads versus secure them.
Deploy more terrifying methods of warfare, use of whistling/fire/barbed arrows to affect morale in battle, possibly setting bushes/trees/logs aflame.
Terrifying weapons/relics/standards/banners decorated with skulls etc. to carry notoriety of the Brothers.
This gameplay should impact relationships with local towns/cities, increasing prices or perhaps no trade at all.
Forgiveness for these sins should be available to reverse the effects if desired, perhaps doing good deeds for local churches for free, search and rescue etc.