In the last days of November 2004, Nattulv decided to start a studio project, a "one-man-band" called Nordfrost which became FESTUNG NEBELBURG after a bit more than a year. Nattulv started to write lyrics about the nature-related Germanic paganism of ancestors and the general admiration for nature and the circle of the year as well as of the life of the ancient Germanic people. Another imporant influence (which became more and more important) for Nattulv´s music and lyrics is his homeland