Question: Blood Ritual was released by which band formed in Sion, Switzerland?

full_context: Document 1: Zyklon: Zyklon was a Norwegian blackened death metal band formed in 1998 by Samoth and Trym of Emperor, along with members of Myrkskog. Their style has been described as modern death metal with black and industrial undertones. After more than a 2-year hiatus, the band officially split up in January 2010.
Document 2: Thomas Gabriel Fischer: Thomas Gabriel Fischer (born 19 July 1963), also known by his stage names of Tom G. Warrior and Satanic Slaughter, is a Swiss metal musician. He is considered to be one of the pioneers of the death metal style of singing, which resembles guttural growling. He led the groups Hellhammer and Celtic Frost, and today is the frontman of the band Triptykon.
Document 3: Samael (band): Samael is a Swiss symphonic black/industrial metal band formed in 1987 in Sion, Switzerland.
Document 4: Blood (Spanish band): Blood (also sometimes called "Blood 'Out", used to be called "Capitan Blood") is a Spanish industrial metal band from Alicante, Spain, that was formed in 1999 and still continues today. There have been some remixes of their songs done by other industrial metal artists, including Turmion Kätilöt.
Document 5: Blood Ritual (album): Blood Ritual is the second album by the Swiss heavy metal band Samael, released in 1992 on the Century Media Records label.
Document 6: The Sum of All Fears (album): The Sum of All Fears is the second album by Italian black metal group Cultus Sanguine, released in 1999 by the French independent label Season of Mist (who have bands such as Mayhem and Rotting Christ on their roster.
Document 7: Svartsyn: Svartsyn is a black metal band from Sweden. The band formed in 1991 as Chalice, but changed their name to Svartsyn in 1993. They recorded their first demo in 1994 and their first album in 1998. Draugen, ex-drummer of Dark Funeral, teamed up with original founding member Ornias in 1996 and since then, they are working smoothly together. In 1996 Svartsyn signed to Folter Records and released their debut album "The True Legend". In May of the following year, a tour of 9 dates in the Netherlands and Germany with Behemoth and Desaster was made. After this tour, Kolgrim (of Unpure) replaced Surth. In June 1997 Svartsyn released "Tormentor" 7” EP. In September 1997 and October 1998 Svartsyn recorded their 2nd album entitled "Bloodline" at Sunlight Studios, which was released as a limited D-LP by End All Life Productions from Italy. In February 2000, Svartsyn recorded their 3rd album "…His Majesty" at Voisin Studios and they signed to Sound Riot Records for the release of this album. In 2003, Svartsyn signed with Sound Riot Records again for the release of their fourth album "Destruction of Man" and for the re-print of "Bloodline" album including the "Tormentor" 7” EP as bonus track. "Destruction of Man" was released in the summer 2003 and "Bloodline" in September 2005. Their latest album is "Timeless Reign" which has been released through Carnal Records from Sweden.
Document 8: Black Metal (Venom album): Black Metal is the second album by English heavy metal band Venom. It was released in November 1982, during the great flourishing of metal music in the UK that was the new wave of British heavy metal, and is considered a major influence on the thrash metal, death metal and black metal scenes that emerged in the 1980s and early 1990s.
Document 9: A Sorcery Written in Blood: A Sorcery Written in Blood was the first demo released by Norwegian black metal band Gorgoroth. The title of the demo was taken from the lyrics of the song "The Return of Darkness and Evil" by the band Bathory. The demo was released in 1993 as a limited edition hand-numbered cassette. A 7" vinyl bootleg also existed; however, there were no official reissues. Due to the Satanic imagery used on the demo cover, the newspaper "Firda" in Førde in Sogn og Fjordane, Norway, ran a front-page story on the demo and Gorgoroth on 7 January 1994. The demo led to the band landing a record deal with French record label Embassy Productions. The track "Sexual Bloodgargling" was an early version of the song "Ritual", re-recorded for Gorgoroth's first album "Pentagram".
Document 10: The Samans: The Samans (), is a Chinese Industrial metal band that was formed at 2007 in Changchun, Jilin. Currently it has five members, Lifu Wang (Lead Vocal)、Yaxin Gao (Programme/Samples)、Zhichao Ren (Guitar)、Xiaoyu Cui (Guitar)、Ji Qi(Bass). The name of their band is from their five members' (those who from Northeast of China and Inner Mongolia Region) Religion. The member chose to use "The Samans" as their band's English name instead of "Shaman" because they insist it doesn't spell like that in their national language. Most of their songs are in English.
Document 11: Michael Locher: Michael Locher (a.k.a. "Vorphalack", or simply "Vorph") (born 7 January 1969) is a Swiss musician who provides vocals and is a guitarist for Swiss industrial/black metal band Samael. He co-founded the band in 1987 with his brother Alexandre Locher (also known as "Xytras" or "Xy") on drums. Michael's musical influences include Celtic Frost, Slayer, Iron Maiden, Motörhead, Venom, Bathory, and early Possessed. Michael particularly points to Bathory as a source of inspiration for vocals:
Document 12: Satyricon (band): Satyricon is a Norwegian black metal band, formed in 1991 in Oslo. Satyr and Frost have been the band's core members since 1993. The band's first three albums typify the Norwegian black metal style. Since its fourth album in 1999, the band has strayed from this style and included elements of traditional heavy metal in their sound. Satyricon was the first Norwegian black metal band to join a multi-national record label (EMI).
Document 13: Sintax: Sintax is a thrash metal & heavy metal band formed in Jerusalem, Israel in 2010 as the band Shworchtsechaye disbanded. Sintax is considered a super group in the Israeli metal scene. The band has had many lineups throughout its inception as well as many variations in its style and musical approach fluctuating from punk, crossover and metal core influence into a heavy metal, NWOBHM, thrash and death metal sound, due to lineup change.
Document 14: Satanic Blood Angel: Satanic Blood Angel is the first compilation album by American black metal band Von. It features the "Satanic Blood" demo released in 1992, the unreleased "Blood Angel" demo and a live recording of a gig played in their home city, San Francisco, California. The compilation was released in 2003 by Nuclear War Now! Productions as a double CD and by From Beyond Productions as a single CD. Besides the "Satanic", "Blood Angel" and "Satanic Blood" demos, "Satanic Blood Angel" is the only current licensed re-release of the Von demos compiled for sale, excluding "Satanic".
Document 15: Alastis: Alastis was a Swiss gothic black metal band formed in 1987 in Sion, Valais.
ground_truth: Samael