Pursuit of Mana [Mage Knight, LitRPG]

Born into a family of warriors, Kal Lunvale dreams of becoming a mage. Ever since he could hold a sword, he has trained with it, preparing for the Coming-of-Age quest that every Lunvale must complete. A mysterious book detailing the world of mana leaves Kal torn between his responsibilities as an heir and his dreams of being a mage. But on the day of his trial, when he is supposed to step into the world of mana and awaken, the pact that has held the peace for decades is broken. Otherworldly rifts start spewing enemies, threatening to overrun the realm. To keep his dreams and protect his family, Kal must choose: the pursuit of mana or the path chosen for him.