Father Caius was a devoutely religious man in Avernum. In 781 IE, he helped Mother Claudette in establishing the Temple of the Good Spirit in Formello. However, he did not stay long, and during the First Slith War, he fled for safer territory. Later, shortly before the onset of the Empire-Avernum War, he heard of her death. Mournful, somewhat guilty, and determined to continue the Church, he travelled to Formello to continue the religion, renaming it the Church of the Bright Star.