Benjamin Buss, best known by his stage name Matthew Greywolf, is a German musician, best known as the lead guitarist and a main songwriter in the power metal band Powerwolf.

Blood of the Saints is the fourth studio album by German power metal band Powerwolf, released in 2011. It is the band's first album with songs that had music videos, made for "We Drink Your Blood" and "Sanctified with Dynamite". In addition to recording at Studio Fredman, Sweden, the band recorded some parts of the album in the 12th-century Deutschherrenkapelle chapel in Saarbrücken.