In his new Extend story mode, it is revealed that when he was swallowed by the cauldron during the initial experiment with Terumi and Shuichiro Ayatsuki, he did not die but was actually sent forward 80 years into the future, to the year 2179. In the process, he lost his memory, but gradually started to regain it over the years, stating that the feeling was as exhilarating as placing books back on shelves (a personal pastime of Relius'). After reuniting with Terumi, he continues working with him in secret, and during the timeskip to the present day meets and marries Ignis, which in turn leads to the birth of Carl and Ada.

Relius is actually his own grand-father.