Agni Caste is one of the two "Gears" or "Modes" that Ignis D. Hiro came up with after losing to BLANK for the second time. Realizing he could not keep up with fast and strong foes, he came up with this form to push his body to its limits. This form's main strength is that Hiro takes advantage of his immunity towards heat, and utilizes it. This gives him a boost of offensive strength rather than speed.