Dao Fruit of Hundred Rules was very helpful to Yu Tian. He was able to comprehend all 108 Rules of Chaos. Not only did he comprehend these Rules, but he also decided to create a unique cultivation technique that suited him the best.
Just like that, Yu Tian spent hundreds of years inside the Secret Realm before he managed to lay a good foundation for his cultivation technique.
In the past hundreds of years, he only managed to lay a good foundation, he did not create the cultivation technique.
One could imagine just how formidable this cultivation technique must be.
It was also around this time Yu Mengfu, Yu Tian's master managed to secure the position of supreme and became the First King of Chaos.
Years passed quickly and hundreds of thousands of years passed just like that.