Khaos Legions is the eighth studio album by Swedish melodic death metal band Arch Enemy. It was released on May 30, 2011 by Century Media. The record marks a return to new, original material, after releasing the Tyrants of the Rising Sun - Live in Japan live CD/DVD (2008) and The Root of All Evil (2009) which consisted of a selection of re-recorded songs from the band's back catalog. It is the band's ninth album counting the compilation. Khaos Legions debuted at number 78 on the Billboard 200, selling around 6,000 copies. This surpasses both Doomsday Machine and Rise of the Tyrant, making it the band's highest-charting effort so far.