Question: Heritage of Satan is the ninth studio album by Czech black/heavy metal band Root and counts with many guest musicians, such as a Polish musician who was also a what?

Context articles: Adam Darski
Zjevení
Hell Symphony
The Temple in the Underworld
Kärgeräs
The Book (album)
Big Boss (musician)
Marcin Rygiel
Heritage of Satan
Kärgeräs – Return from Oblivion

Adam Nergal Darski (born Adam Michał Darski; 10 June 1977 in Gdynia) is a Polish musician and television personality, best known for being the frontman for the black/death metal band Behemoth.
Zjevení (English title: "Revelation") is the debut album by Czech black metal band Root, released on December 1990 through now-defunct record label Zeras.
 It is noticeably the only full-length album by the band to feature songs with lyrics in the Czech language, and is regarded for shaping the sonority of the early Czech black metal scene of the late 1980s/early to mid-1990s.
Hell Symphony is the second full-length album by Czech black metal band Root.
 It was originally released in 1991.
The Temple in the Underworld is the third studio album by Czech black metal band Root, released on December 1992 through Monitor.
 This marked the end of their early raw black metal sound, and was also their last release with guitarist Daniel "Mr. D.A.N." Janáček.
 It was re-issued under CD format by Monitor with two bonus tracks.
Kärgeräs is the fourth studio album by Czech black metal band Root, released in 1996 through Black Hole Records.
 Beginning with this album, Root began to drift away from their traditional black metal-inflected sonority, seeing them advancing towards the hybridization of black and heavy metal they are currently famous for.
The Book is the fifth studio album by Czech black/heavy metal band Root, released on 24 June 1999 through Redblack Productions.
 It was the band's first album with guitarists Marek "Ashok" Šmerda and Aleš "Alesh A.D." Dostál (even though the latter left the band after the album's release, and only returned in 2014), and their second of four albums to be recorded at the Shaark Studio in South Moravia, the others being "Kärgeräs", its sequel "Kärgeräs – Return from Oblivion" and "Black Seal".
Jiří Valter, better known as Big Boss, is the vocalist for the Czech black metal band Root, the progressive metal band Equirhodont and eponymous band with ballads.
Marcin "Martin" Rygiel, (born 30 April 1983 in Krosno, Poland), is a Polish musician, best known as the former bass guitarist of the technical death metal band Decapitated from 1997 to 2007, leaving several months before their hiatus.
 He was also a member of the avant-garde metal/black metal band Lux Occulta from 1998 until their hiatus in 2002.
 In June 2008, Rygiel toured with the death metal band Vader as a session musician.
 In 2010, Rygiel joined California-based death metal band Annihilated as their bassist until 2013.
 He was the bassist for the Egyptian-American death metal band Nader Sadek from 2014 to 2015.
Heritage of Satan is the ninth studio album by Czech black/heavy metal band Root, released on 25 October 2011 through Agonia Records.
 It was their first album to be released by Agonia, as well as their last one with guitarist Marek "Ashok" Šmerda, who left the band three years later to join Cradle of Filth.
 The album counts with many guest musicians, such as Erik Danielsson from Watain (who also provided its cover art), Nergal from Behemoth, and Blasphemer from Mayhem, Aura Noir and Ava Inferi.
Kärgeräs – Return from Oblivion is the tenth studio album by Czech black/heavy metal band Root.
 Originally announced on 28 September 2016, it was eventually released on 25 November through Agonia Records, and is their first studio album in 5 years since "Heritage of Satan".
 As the title implies, it is a concept album that serves as a sequel to their previous 1996 release, "Kärgeräs".
 Two songs off the album, "Life of Demon" and "Moment of Fright", were released in advance as teasers on their record label's official Bandcamp page as well as on YouTube.