Karellen (Krelian in the English localization) is a major character in Xenogears. By the time of Xenogears, Karellen is a leader of Solaris, despite that he was once Solaris' enemy. Using the power of science and technology, such as nanomachines, Karellen is 534 years old as a result of his life extension treatment, and retains the appearance and health of a young man.