The Son of the Prophets by Bryan Wilson

"Those of white and those of flame will clash, and the universe will begin to shake." Colton's mission is straightforward: go home to Earth, wield the power of the stars for all to see, and seek the prophet his planet was named after. But nothing has come easy since he left his world. Traitors lurk in the shadows, causing chaos across the stars. War has begun, and with newfound responsibilities arising, those around Colton realize they will have to carry some of the burden if there's to be any hope of defeating the Army of Flame. Ace and Morris set out on their own course, hunting a rogue admiral down at Willick's side. Meanwhile, Violet Doku travels with her fellow soldiers of Vintara Company, sailing to the mysterious Forsaken Barrier, where the fight they have trained for lies in wait. Colton knows he will have to be quick with his tasks if he hopes to fulfill the prophecies and save mankind. But when age-old mysteries are answered, and past conflicts reemerge, he starts to question whether he can even save himself.

Rise of the Sky Pirate by S.W. Raine

Before becoming the infamous sky pirate from The Techno Mage, Benedict Keenan was a disorderly drunkard from London Below—and in this spin-off series, his story is finally being told. Straying from his dream of living like the nobles in the Upper Lands for far too long, Benedict takes on an easy mercenary job with a band of rogues to quickly get back on his feet. But when a surgeon from the Upper Lands—the sole survivor of a sky pirate attack aboard an airship returning from an important science convention—is found in the middle of the Atlantic Ocean, Benedict is suddenly thrust into a dangerous high-stakes race against a poisonous alchemical infusion set to be released into the Great Lakes. What’s worse is that a man from Benedict's past is at the center of it all. Can he stop the sky pirate before the world becomes mind-controlled? Rise of the Sky Pirate is an action-packed steampunk adventure that reaches for the stars while saving the world along the way.