"A Gamble of Flame and Flare" is the fourth and final iteration of the “Underlord Saga” following Samir, Samuel and Cindi in defeating Ashwine.

The story begins with Ashwine awakening from imprisonment in ice in the North Pole. His flames have transformed from solar energy to icy white fire, granting him new abilities. After massacring people in Estonia and Yemen, he travels to Egypt to sleep in Tutankhamun's tomb and grow stronger. Ashwine's flames evolve again into Golden flames.

After gathering the three fire constellations using “revenge” as the main catalyst to persuade them, Jaxton Ozim rests Elias to fight the emerging kings. He trains the teens to become a coordinated team, learning about their potential.

The story climaxes in a battle in the Arabian Desert. Using teamwork, the three teens defeat Ashwine. Samuel first creates a rule preventing Ashwine from reforming. Cindi then uses her explosive powers to fragment Ashwine's body while Samir delivers the final blow with his magical arrow, scattering Ashwine's essence across the Earth.

In the aftermath, Samir realises his arrow contains his father's spirit, which had been helping him all along. The three teens find closure for their losses and form a strong bond through their shared experiences and "fiery spirits.”