Frost was not limited to the success of Satyricon, as he is also an active member in another well-known band: 1349. Their enigmatic name has the time when black death came to Norway, killing 2/3 of the population of the country. Like Satyricon, he was not an original member of the band, as he participated in the first EP "(1349" at 2001) as a music session. This changed to the first album, "Liberation"(2003), which is very fast, raw and oldschool. When he listened to its material, he was excited and asked to be promoted to permanent member and so his desire was fulfilled. 