Fourth album from the successful American progressive metallers and follow up to their 2006 major label debut Blood Mountain. That album, while their most successful, drew criticism from some fans for its seeming lack of focus. This album seeks to remedy that issue by having a unified concept in which an astral traveller wanders the spirit realm, exploring themes from quantum physics to Czarist Russia, and musically is as complex, brutal and enthralling as their earlier work.