Diamond Indestructible Stronghold Master

My name is Jiang DaLi, a mediocre player in the Martial Arts Universe game, and after a few rounds, I got killed. I never thought that I would be reincarnated as a mini boss in a mountain fortress, and retain memories of my previous life. Not only that, I can also cultivate and upgrade like a player! In this life, I want to become the strongest before other players even enter the game!