In 2004, Root played on the Open Hell festival with [[Watain]], [[Törr]] and other bands.ref In 2011, they released the album Heritage of Satan, featuring [[Aura Noir]] and [[Ava Inferi]] guitarist [[Rune Eriksen|Rune "Blasphemer" Eriksen]], [[Behemoth (band)|]] vocalist [[Adam Darski|Adam "Nergal" Darski]] and Watain vocalist Erik Danielsson, who also created the album cover, as guest musicians. Although Big Boss is the only remaining founding member, the band's core now consists of him, bass player Golem and guitarist Ashok.ref== Musical style and ideology ==
According to Legacy journalist Christian Wachter, Root have, since their beginning, a very own style (although ostensibly [[Venom (band)|]] and [[Bathory (band)|]]-oriented) with an [[occult]] and are one of the few bands deserving the term "cult".ref Portuguese band [[Moonspell]] mentioned Root as one of their influences.ref[[Rock Hard (magazine)|]] journalist Björn Thorsten Jaschinski called them "occult metal pioneers".ref His colleague Wolf-Rüdiger Mühlmann located The Book "in the triangle of [[death metal]], [[gothic metal]] and gloomy rock" with folklore melodies that could be interesting for fans of [[Katatonia]], [[My Dying Bride]], [[Primordial (band)|]] and Thine.ref On Root's homepage, Black Seal is described as a mixture of "the heaviness of 'Hell Symphony', monumentality of 'The Temple In The Underworld', mystery of 'Kargeras' and the dark charm of 'The Book'";ref Mühlmann described it as a mix of [[Mercyful Fate]], Moonspell, [[Anathema (band)|]] and old [[Heavy metal music|heavy metal]].ref For [[Decibel (magazine)|]] journalist Chris D., Heritage of Satan "feels less complete than, say, The Book, which is, for me at least, the best Root album to date".ref The album features "a few rocking songs", Revenge of Hell and Legacy of Ancestors, as well as "more traditional black metal songs".ref
