Supreme swordsman wizard

In a world of magic and swords, only the strong are valued. Luke, son of the strongest ducal house in the empire, has never exploited his talents to achieve the strength that so many desire. He always ran away from responsibilities, until one day someone told him: "When you're about to lose those you love, regretting past choices won't save them." That was the advice that made Luke change his mind and start his adventurous journey. N/A: English is not my first language, I apologize for any mistakes.