Conquering the Heavens: It All Begins When I Transmigrate into Tiangang Legends

[Multiple heroines, nearly invincible, evenly matched with anyone, childhoods ruined, not saintly, the Myriad Worlds] A System lands on him, sending him into the world of The Legend of Qin: The Heavenly Decree. Perhaps he got his transmigration posture wrong or something, because he overshot his destination, returned to infancy, and became the youngest son of Changsun Wugou. When he first arrived, he was no bigger than a grain of sesame, and was imprisoned from the start for ten months. Fortunately, he has a System. It doesn't have many features, but it's incredibly powerful. It guarantees a perfectly even match: no one can beat him. Even if Pangu stood atop the Thirty-Sixth-Grade Chaos Green Lotus, with the Chaos Pearl above his head and the Chaos-Opening Axe in his hand, he could only fight Luo Tian to a draw and couldn't harm him in the slightest. The quest is simple, too: unify the world, and you'll receive a transmigration card that lets you choose any destination in the Myriad Worlds. Doesn't that make him invincible? He can just do whatever he wants!