This innocuous-seeming figure hardly seems worthy of your attention at first glance. The Sacrificial is small, thin, and hunched over. However, if you ignore this creature long enough, it slowly makes its way to the front of the combat line, carrying a large, lit brazier on its back. In Darkest Dungeon, nothing good happens if any enemy, rather than attacking, slowly makes its way towards you. In this case, failing to stop this creature in time ends with a bang.

Source: www.gameinformer.com