Level Zero(誇り滅殺[レベルゼロ]; Reberuzero) also known as Pride Destroyer, is an offensive/supportive magical ability created by Ichijou Tsukino , fromm Berolina Gremory's peerage , during his first Rating Game against Nemesis Gremory , around midway Volume 2 and Volume 3. Dubbed 'The third most fearsome ability against female devils', Level Zero not only stabilish Ichijou's place as Issei's successor, but also as Issei's own anti-thesis.