Cadfael is an ogre and was previously a Mercadir. He and Ro trained together and were often paired up because of their similar strengths. He is one of the known rebel ogres working with the Neverseen.
Cadfael is said to be very arrogant and seems convinced that he is an expert on everything. He was always a bragger, and wanted leadership. He was disgusted at the Neverseen for leaving their own (Umber) after her death, saying that he would never do that to his kind.