Fieriness

noun

1. The state or quality of being fiery or burning, or vehement or impetuous, etc.: as, the fieriness of the sky; the fieriness of a horse.
2. The quality of being fiery; heat; acrimony; irritability.

   "a fieriness of temper"

3. The quality of being fiery
4. a passionate and quick-tempered nature
5. the heat or the color of fire