Main ingredients include one part corrosive, uber-slow funeral doom (all riffs and no drums!), one part solemn neofolk acoustics and one part Scandinavian rune chants. The merging of these together works like a charm -- the strumming guitars mingle rather well with the infernal black metal rasp and disharmonic distorted riffing, creating a droning, ambient mood that is strengthened by the occasional ritual passages of tribal percussion, narrations and incantations in archaic Danish or maybe even old Icelandic. Sitting through the whole 55 minutes of _Yggdrasil_ is a rather entrancing experience -- the music has a definite experimental edge, thus devoid of any conventional song structures and best enjoyed as one whole piece of art.

As with previous Grívf releases, the concept obviously delves deep into pre-Christian Nordic tradition -- Isar's own lyrics are accompanied by excerpts from the "Havamal" and the album art is designed accordingly with runic inscriptions and symbols of olden faith.