The Cinder Spires

Since time immemorial, the Spires have sheltered humanity, towering for miles over the mist-shrouded surface of the world. Within their halls, aristocratic houses have ruled for generations, developing scientific marvels, fostering trade alliances, and building fleets of airships to keep the peace. Captain Grimm commands the merchant ship Predator. Fiercely loyal to Spire Albion, he has taken their side in the cold war with Spire Aurora, disrupting the enemy's shipping lines by attacking their cargo vessels.

Benedict Sorellin-Lancaster hasn't even broken in his lieutenant's insignia when he's summoned to meet with the Spirearch of Spire Albion himself for a very special—and very secret—purpose. The Spirearch needs Benedict to retrieve a bag he's "misplaced" on the Colony Spire known as Dependence, which has strangely cut off all contact with the outside world. It's a delicate mission at best, a potential bloodbath at worst. To this end, the Spirearch has supplied Benedict with backup in the form of three Warriorborn. 

For centuries the Cinder Spires have safeguarded humanity, rising far above the deadly surface world. Within their halls, aristocratic houses rule, developing scientific marvels and building fleets of airships for defence and trade. Now, the Spires hover on the brink of open war. Everyone knows it's coming. The guns of the great airship fleets that control the skies between the last bastions of humanity will soon speak in anger, and Spire Albion stands alone against the overwhelming might of Spire Aurora's Armada and its new secret weapon.