Mage

The second novel in J David Baxter's epic portal fantasy series, the Greymantle Chronicles. 

After surviving and defeating a plot to plunge the continent into war, Nate loves his new life. He has been awarded a knighthood and a position in the Royal Guard, where he has made good friends as close as family. Unfortunately, he is torn by the need to return home to save his sister from the consequences of his mysterious disappearance. Given a chance to petition the most powerful mage in the kingdom for help, he may soon have to decide between magic and the sword, thanks to guild politics, or face dire consequences. He may even find a surprising chance for romance. Still, none of it will matter if he can't survive assassination attempts from Blood Mage agents out for revenge.

Set in a unique world of swords and magic that is medieval in flavor but seen through the lens of a modern college student from Earth. The Greymantle Chronicles are an epic fantasy series on a high magic fantasy world where technology and science never existed. Yet, cities are cleaner, banking is done with magic tokens, floating carts are used to haul freight, and magic is a science in its own right.