In Una, skylands drift and gemstones power magic and machines, a grand conflict rages in its skies. Temora, raised under the strict rule of the Argentian Regime, dreams of rising through its ranks and exploring the sky's endless expanse... her ambitions are shattered when war takes the life of her father, a revered military leader.

Driven by vengeance, Temora vows to master the gemin stones to use their power to destroy those responsible for her father's death. As she trains, she crosses paths with a mysterious mentor with unknown ties to both sides of the war. Under his guidance, Temora, drawn by forbidden magic and secrets of the unknown, reveals truths questioning her understanding of the enemy she swore to destroy.

Torn between loyalty to the regime that raised her, and this new information; Temora must decide what her true allegiance lies. Will she continue to fight for a regime seeking conquest and destruction, or join the enemy's desperate struggle to end the bloodshed?