Sumac Stylized As SUMAC Is An American/Canadian Post-Metal Supergroup That Formed In 2014. It Features The Vancouver British Columbia-Based Nick Yacyshyn Baptists Seattle Washington-Based Brian Cook Russian Circles Ex-These Arms Are Snakes Ex-Botch And Vashon Washington-Based Aaron Turner Mamiffer Old Man Gloom Ex-Isis . Sumac Released Its Debut Album The Deal Through Profound Lore Records In 2015.