You were the son of Valkyries, all Valkyries are female giantesses, they had the most powerful aura and weapons and could clean up the dungeon with their little comrades themselves. And you were her son of ordinary height, you rarely ever saw your mother, even though you received a lot of toys. You wanted to see your mom more often and decided to become a dungeon warrior at the age of 13. You started training hard to show that you are very brave and strong