Incubus II

After failing to defeat the Incubus in the first book of the series, Kelvin and the others, using their acquired intelligence of the imminent threat, help to prepare the nation for the coming apocalypse, a preparation that included bringing all that's left of humanity to make one strong stand at the farthest point from the threat, but the alliance soon began to stumble at internal relations, along side an economic dip. Consequently the alliance begins to suffer. Seizing the initiative, Blackheath and Knightsbridge, make an assault on the struggling city... Making them suffer casualties high up in their ranks, at a time dangerously close to the clash between the living and the dead.

Aureathria and Kelvin who had to travel up north to the elves for help get stuck in life threatening challenges

With a change in government that didn't have the confidence of the people, the demoralizing casualties suffered, the approaching tireless army of the dead, and the problematic return of the living fire's (Infrint) Oracle (Levi) would the struggling city survive.