Knights of Bloodsteel(2009)

Knights of Bloodsteel is a fantasy series set in the magical realm of Mirabilis, once sustained by an all-powerful metal called bloodsteel. As supplies dwindle and the land crumbles, the tyrannical warlord Dragon Eye schemes to monopolize the remaining bloodsteel and seize absolute power. An ancient prophecy awakens four ordinary citizens to challenge his ambitions. Their only hope lies in reaching the legendary Crucible—the source of all bloodsteel—before Dragon Eye's dark forces consume their world entirely. The fate of Mirabilis rests on these unlikely heroes and their race against time to prevent catastrophe.