Under Sullen Skies delivers a blackened fury of extreme metal, intertwining with savage, doom-laden brutality. Focusing on dark and foreboding tales of folklore and the occult, it captures the agonizing misery, furious vexation, and psychological turmoil that is ravaging humanity at present day. Under Sullen Skies not only sees mastermind Mike Hill and the band expanding their creative and collaborative comfort zone, but includes a wealth of guests, such as Intregrity's Dwid Hellion, Six Feet Under's Ray Suhy, Black Anvil's Paul Delaney, Psycroptic's Todd Stern, Black Crown Initiate guitarist Andy Thomas, Ides of Gemini/Black Math Horseman's Sera Timms, and Cat Cabral.