Warthur
Ambient neofolk explorations of the futhark runes and their mystical interpretation aren't new - for instance, Ian Read's Fire + Ice project did Rûna - but few go into the subject as deeply and as long as Wardruna's Runaljod trilogy. This first entry in the sequence establishes the general pattern - you have folk-tinged ambient and ambient-tinged folk melded together by the skilled hands of Kvitrafn for the most part (Hallvard Kleiveland guests at points on the fiddle), whilst Lindy Fay Hella tackles most of the vocals (backed up this time by Gaahl and Kvitrafn himself).
It is quite distant from any of the metal projects some of the band members have been involved in, but those interested in the various dark ambient and folk subgenres that have cross-pollinated with black metal may find it an interesting voyage, as would fans of neofolk and other such avant-folk subgenres.