The Archangel's Blade

In an alternate history where the world is divided in two, the known world, and the unknown world, A King must send his best knight to investigate a rumor in the unknown half that could destroy all life. Once the knight finds his companions in his journey towards the mountains that separate the world, he discovers that the rumor was a definite threat if it isn't dealt with immediately. To deal with the problem, people come across Heavenly powers, but is the price of wielding these powers greater than what could happen if the world is left at the mercy of a being from another realm?
"He couldn't do it. It was nearly there now. He closed his eyes, his fate was decided. Nothing could defeat this monster."