Nachtmahr is a name of least three artists: [1] An industrial techno pseudonym of Thomas Rainer (aka L'Âme Immortelle and the defunct Siechtum). Inspired by numerous years of DJing, the first release, "Kunst ist Krieg (i.e., Art is War)", and it’s club hit, BoomBoomBoom, quickly became worldwide industrial club staples and earned the band a slot on the soundtrack of the American blockbuster movie, SAW IV. However, the success of the EP was far surpassed with the release of the full-length album, "Feuer frei".