Enders' Gate: End of a Golden Age

Joshua III of House Tzipur, a crippled boy of noble lineage, lives upon the perilous edge of a mighty golden age.
A seemingly invincible wyrm stalks the skies above the Kingdom of Nebo, terrorizing everything in its path and demanding human and animal sacrifices in exchange for its civility. Perhaps only one weapon can defeat this wyrm, and that weapon is a giant golmech named Adramelech. This poses a serious problem, because Adramelech requires human blood and willpower to function and has rejected every single potential pilot to climb inside of his bloody torso for the past thousand or so years.
To complicate matters even further, representatives of a foreign Skylander kingdom have come to Nebo and are offering to slay the wyrm in exchange for a military alliance that will drag Nebo into an unwanted war against an ancient enemy. An enemy who has already broken the backs of the Skylanders once before.
Golmechs, demons, and alien insects loom upon the horizon, and Joshua III must fight them all.