Flashfire Fist is Endeavor's signature technique. Endeavor raises his fire's temperature to its highest level and maximizes his power. Doing so, the Flame Hero can unleash devastating flame attacks or increase his speed dramatically. Flashfire Fist condenses Endeavor's flames into a white-hot point and is meant to act as a one-hit finisher. Endeavor can perform several variations of his Flashfire Fist move, each with a different form of attack.
Endeavor used Flashfire Fist several times against the High-End Hood, which raised his temperature dramatically, a glaring weakness when using this technique.