I Have a Dungeon in my Backyard

I thought things would quiet down when I moved... I was wrong. Kaiden had found it odd that his granduncle left him his home, but thought that moving in would be a nice change and a new start to his crumbling life. What he didn't know was that his uncle was hiding a very dangerous and interesting secret. In the backyard, beneath a heavy steel hatch, lies the entrance to an underground labyrinth. A dungeon straight out of a fantasy. With a system straight out of an RPG and weird messages about some core, his supposed peaceful life is thrown out the window. Now he has to deal with leveling up and making sure no one finds out about his secret, which would be a lot easier if the next-door neighbor didn't seem so interested in the house. Whatever happens, Kaiden's life is about to get real interesting.