The Apostles are a secretive clan of assassins and skilled warriors who train others at young ages to become like them. Their themes are highly reminiscent to Christianity, giving members names of Angels, Demons, and references to Biblical events or objects. Cain Masasaki is an Apostle, his former name in the order being "Azrael". The Fury is another member of the Apostles that was "contained" due to being deemed too dangerous and powerful to release into the world, though he broke free and slaughtered his captors. It is currently unknown if the Apostles still exist as a central organization, though it's hinted that there are still members out there.