Ling Cage: Starting with the Nine Nether Profound Arts, I Crush Mana

[Reverse Tower Defense tech + Bad Guys cultivation techniques + multiple heroines] Good news: I've transmigrated! And I have a System. Bad news: I've transmigrated into the Spirit Cage world, and the main story won't begin for some time. ・・・・ After Feng Xiaoyao was suddenly sent to his death by a truck while watching a show on the street, he somehow found himself in the Spirit Cage world with a humanoid System. ・・・・ Mark: “Next to him, my gravity armor feels like it's made of paper.” Mark, fanged-beast version: “Is he a fanged beast, or am I? Why do I feel like a little kid next to him?” Penny: “Donny, don't contact me anymore. I'm afraid Feng Xiaoyao will get the wrong idea.” 4277: “Are you sure this ritual can really awaken the source of my life?” Lightkeeper: “I think I've found a new faith.” 4068: “Bro, can I ask you a favor? Could you let me off the hook?” Charles, in Abyss Walker armor, when Feng Xiaoyao isn't around: “You are all insects!” When Feng Xiaoyao is around: “Bro, I was only joking just now. Don't take it to heart.” Maiduo: “Xiaoyao, is this really the right way to practice?” Bai Yuekui: “Would you rather I cut you in half vertically or horizontally?”