A former Cursor Callidus, Fidelias turns traitor to the Crown at the outset of Furies of Calderon. He has an extensive knowledge of the Deeps below Alera Imperia. Fidelias, like most earthcrafters, also hates flying. He has the ingrained habit of checking anywhere he goes for the best route of escape.
At some point, Fidelias was initiated into the House of the Faithful, while his guise of the Legionare Marcus was entered into the House of the Valiant.