A Vow of Glory (The Sorcerer's Ring #5) by Morgan Rice

In A VOW OF GLORY, Thor embarks with his Legion friends on an epic quest into the vast wilds of the Empire to try to find the ancient Destiny Sword and save the Ring. Thor’s friendships deepen, as they journey to new places, face unexpected monsters and fight side by side in unimaginable battle. They encounter exotic lands, creatures and peoples beyond which they could have ever imagined, each step of their journey fraught with increasing danger.