Blood Ritual was released by which band formed in Sion, Switzerland?
Samael
Title: Ancient Rites
Passage: Ancient Rites is a Belgian black metal band formed in 1988.  Initially, the lineup consisted of guitar players Johan and Phillip, drummer Stefan, and Gunther Theys on bass and vocals.  In 1990 the "Dark Ritual" demo was released in the underground scene, getting worldwide attention just as black metal was gaining importance in the metal scene.  Soon after the release of this demo Phillip died in a car crash and not long after, Stefan committed suicide.  However painful this episode was to the band, they decided to continue and Stefan's position was taken by his drum roadie Walter Van Cortenberg.
Title: Blood Ritual (album)
Passage: Blood Ritual is the second album by the Swiss heavy metal band Samael, released in 1992 on the Century Media Records label.
Title: Samael (band)
Passage: Samael is a Swiss symphonic black/industrial metal band formed in 1987 in Sion, Switzerland.
Blood Ritual (album) Samael (band)