 Other highly influential Viking metal bands are <unk> , <unk> My Betrothed , Einherjer , Ensiferum , Moonsorrow , Thyrfing , and Windir . Trafford and Pluskowski call Einherjer , Moonsorrow , Thyrfing , and Windir , the " most influential " Viking metal bands and write that , apart from Enslaved , the album covers of Einherjer give that band the most " Viking " feel of all , due to the prevalence of Viking artifacts . They elaborate that Einherjer 's artwork spans the full chronology of Viking art : 8th and 9th century Oseberg to 11th and 12th century Urnes . Writing for AllMusic , Craig Harris stated that <unk> My Betrothed " combine songs about ancestors and Norse gods with electrifying , to power @-@ driven , arrangements , creating a new style of music , that they call , ' Viking metal . ' " 
