General Mayo Deftinwolf is the head of the United Red Army and right hand to Wilhelm Ryan. He is a primary antagonist in The Amory Wars and is personally responsible for the deaths of several main characters, including Leonard Hohenberger, Mariah Antillarea and Jesse "Inferno" Kilgannon. He also orchestrated the deaths of Pearl Hohenberger, Coheed, Cambria and the Kilgannon children (save for Claudio). Mayo was assembled by Gyatronic Technologies Inc. and issued to Ryan during the Second Era (before the Mage War). He was the first Z-class cybernetic organism of its kind, an amalgamation of the defensive traits of the G10 and Y series, fused to create an organism suitable for military combat. Through years of training and programming, Deftinwolf was positioned as General to the Red Army.