The Portals of Hell - The Portals Series, #1

Davin is good at math and science, inconsequential to his military family, where his older brother will soon become commander of the Army of the Republic. His father once conquered the southern land-and now his youngest son has flunked out of Academy, a complete failure as a cadet.  But something else is going on in Davin's life. Why does he sometimes have visions and dreams of terrible events, war, and strange, exotic and deadly creatures? After returning home, a Hellport opens nearby, spilling out monsters that kill and maim-and he had a premonition of the event!  He is tested for a Gift, the ability to control God's own Power, and the result is terrifying.
He begins a quest to find answers to his many questions. Before he finds them, he will face more Hellport monsters, overcome an army, and find a new home among mountain tribes who will help him discover his destiny.