He was born and later orphaned. He then met his best friend and spent hundred of years venturing the unknown world but later they encounter a powerful monster a Dragon. They fight well but later they discovered that they can't kill the dragon without a sacrifice for one's soul. My character best friend sacrifices himself in order to kill the dragon. After my character's best friend died, my character swore that he should be hunting monsters until he meets his true enemy that will kill him or die until he run out of luck.