Wirklich appears to be the leader of the Germanian army that invaded Gaul. He claims that he and his sister are powerful Shamans.
He has stated his goal as the slaying of Demeter. He has stated that Demeter attacked his town with snakes, and he seeks revenge for it.
Update: Wirklich stabbed himself in the heart and died outside the gates of Paris, at the Temple of Athena.