Diluc was once an ideal young man, dedicated to his work with Knights of Favonius. After his father's untimely demise as a result of using a Delusion, along with Inspector Eroch ordering Diluc to cover up the incident, his faith in the Knights shattered and he left the organization. Even after Eroch was purged from the Knights for being a traitor, he still holds resentment towards them. He claims that the Knights take too long to get the job done.