Cobble City

Long ago, not sure of the exact time, but near the beginning, an evil sorceress emerged and, over time, formed a large army of vicious barbarians that obeyed her every command. They would go to a civilization, take it over, make the people their slaves, destroy the city, then move to the next.
At a moderate-sized village lived four young men. Two are brothers, Mount and Marc, both big warrior-type men. Then there is Jax, the inventor, and Hem, who has special abilities he doesn't understand. Hem has visions of the barbarian army destroying their home. So on a journey to find metal for Jax to make weapons, Hem has a vision of a beautiful city nearby being attacked. They go to warn them and are laughed at, but little do they know, this city and the people will change their lives forever.