Guardian of the Dungeon (Magi: Labyrinth of Magic FanFiction)

Everyone has a desire, a want. If you had power, what would you do? What is your wish? "I want you to be my friend." "To change the world with my bare hands!" "I want to get stronger." "To establish a country that can change the world!" "We will unify this world under one sole king."
Eh? You're asking me? Well, it's pretty obvious. I want to protect those I hold dear. After all, I did promise I would keep them safe. And I plan to keep it. No matter what. So you who plan to stop me and dare try to get in my way? Let's just say we're gonna have a problem.