What makes Nattväsen by Månegarm notable?

'Nattväsen' received critical acclaim for its ambitious composition and thematic depth, cementing Månegarm's influence within the folk and Viking metal subgenres. The album contributed to the ongoing popularity of these genres in Europe during the late 2000s, reflecting a resurgence of interest in Norse mythology and heritage in contemporary music. By the time 'Nattväsen' was released in 2009, Månegarm had established themselves in the Swedish metal scene with a unique sound that fused black metal with elements of folk and Viking heritage. This album marked their fifth studio release, following 'Vargstenen' in 2005, showcasing their continued evolution in blending heavy riffs with traditional Nordic themes.