Defenser is the main defensive spell of Fate Testarossa, as she focuses on speed and standalone action. She has set it as her Auto Guard spell so that Bardiche can auto-cast it. It is also presumed that Presea Testarossa, Rynith and Alph uses Defenser instead of Protection in The Gears of Destiny. On another hand, Ginga Nakajima is a known caster of the Modern Belkan version. Notably in the movie continuity, when being broken, the barrier will be shattered into hexagonal pieces, matching Presea Testarossa's barrier design.