Global Rock juggernauts Slipknot have announced the next phase of their uncompromising history -– the release of .5: The Gray Chapter – the fifth studio album from the Grammy Award® -winning group – arrives on October 21st, while their North American Prepare For Hell tour, promoted exclusively by Live Nation, is set to kick off immediately following the band's previously announced Knotfest (October 24th – 26th). The major tour heads to Mohegan Sun for a Friday, December 5th concert, beginning at 7:30pm.