According to some sources, Njörun and Dain's lives took a turn for the tragic in what's known as the "Tragedy of the Gáe Bolg". Njörun fell in love with an unnamed Thracian knight who also was a friend to Dain, married him after the war, and they lived happily for some time. However, while trying to stop a fight between her husband and Dain, Njörun accidentally killed her spouse with the Gáe Bolg. Broken with grief, Njörun committed suicide to join her husband in death, and few years later Dain also died in mysterious circumstances. Ever since then, Manster and Thracia have had huge difficulties.
Njörun was a goddess in Norse mythology.