Denchi Denchi no Mi/Agni Caste Techs.

Overview
Agni Caste is one of the two "Gears" or "Modes" that Ignis D. Hiro came up with after losing to BLANK for the first 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 giving him a boost of speed, furthering his reaction time as well. Hiro in this form takes advantage of his immunity towards heat, and uses it. By overcharging his body, he allows himself to combust, much like a battery would when overheating.

Hiro now gains all the capabilities from Indra Caste along with the power of fire. He can now move faster and dish out stronger attacks than before. He further controls this fire with Ho Kenpo and Fu Kenpo. Though he does not know Honoo Kenpo, he uses the same generic combination to control these flames.

Trivia

 * Name of this "Mode" is a pun off of the Hindu god of Fire: Agni.