Horrendous was conceived in the womb of early 2009. With a fascination and utter obsession with the old school, the band emerged from a desolate scene, weaving webs of raunchy riffs through the rehearsal space air.

A demo entitled Sweet Blasphemies was written by the spring of 2009, and recorded in the summer. Copies of the demo were sold on CD-R through the band's myspace page. In mid-2010, Horrendous signed on with Skeleton Plague Records and Dark Descent Records, who co-released Sweet Blasphemies on cassette tape in June. The first pressing of this tape was limited to 200 copies, and was sold out in a couple of months. In March 2011, a second pressing of the Sweet Blasphemies demo was released.

In the summer of 2010, the writing process for a full-length album was completed. The band has been in the recording stages ever since.