Han startet bandet Urgehal i 1992 sammen med «Enzifer» i 1992. Han deltok på syv studioalbum før hans død i 2012. Bandet kom med følgene uttalelse rett etter Bråthens død på plateselskapets Facebook-side:
The greatest is gone. Trondr Nefas, our dearest friend and companion for more than 20 years, suddenly passed away last week. He died a peaceful and natural death at one of his favourite places, surrounded by woods and crystal lakes. Thanks for all the years with friendship, music and madness. For the good times and the bad times. Through your dark devotion for black metal, you have inspired so many. You were a true pioneer. We will miss you, but never forget you, because your legacy will live on. Our deepest sympathy goes to Trond’s fiancée Octavia, and both of their families. We appreciate all of the condolences and support given to us after his tragic death. Sammen var vi dynamitt!!!