Cassius spent over 200 years as an apprentice to whom he is now the successor. As a new maester he must apply his knowledge to discover new lands and locate materials to continue his research. He struggles to keep control of his emotions from losing someone he was close to. This affects his power and study from time to time but for the most part can be quickly handled through meditation. At this stage in life his main goal is to discover new lands because new lands means new friends.