Runhild Gammelsæter is a musician from Holmestrand, Norway notable for being the vocalist for the American bands Thorr's Hammer and Khlyst. She is also a professional biologist. Runhild Gammelsæter was a 17-year-old foreign exchange student from Norway in 1994 when she joined Thorr's Hammer along with Stephen O'Malley and Greg Anderson. After 6 weeks, which was the time it took to release Sannhet i Blodet and record Dommedagsnatt, the band split up due to Runhild returning to Oslo, Norway. Dommedagsnatt was released soon afterwards in 1996 via Southern Lord Records.