Our Last Crusade or the Rise of a New World, Vol. 16 (Light Novel)

THE JOURNEY TO THE FINAL BATTLE BEGINSDespite their long-standing feud, the Empire and the Sovereignty join forces to confront a common enemy--Elletear and the calamity. Both nations assemble elite squads to send into the planet's core, where the calamity sleeps. However, what awaits Iska, Alice, and company on their trek underground is more sinister than they could have ever imagined...