Elf Tensei Kara no Cheat Kenkoku-ki - Chapter 16Book 05: -1: The War Begins

The little princess of the Huo family, one of the wealthiest families, was mistakenly switched out nineteen years ago! The fake heiress is well-educated, talented, and doted on, while the real heiress is an uncontrollable girl who loves to fight, has a strange personality, and had dropped out of school very early…

In the rebirth, in order to prevent the tragedy of the previous life from happening, Bai Yu decided to rush to the [Tower of God] at any cost, and face everything together with his sister!

However, Bai Yu, who was bound by the system, mutated his bloodline, and transformed into a black-scaled python seems to be developing on a completely different path from his previous life…

- Description from novelbuddy

She was the Spirit Master of the Tea Hill. He was the Head of the Kunlun. They met each other by chance in Jiangnan. With many twists and turns, they got married. Unexpectedly, there were plots in store for them. After the resurrection, he forgot her… But she had his child… To meet him again, she endured the torture of the naga poison; for the people of the Tea Hill, she chose to be a devil… But fate still pushed her to a path without a turning back… She killed demons and devils but was used by others… Finally, she had to stand opposite to him… For the happiness and benefits of the three realms, she was incarnated as the Creation Goddess… She was the Spirit Master of the Tea Hill, Jiang Wuyou…

A novel revolving around being transported to another world with an op system. The mc spends his day chasing skirts and doing missions to level up. A standard journey to the top with lots of girls from various animes and games with a twist of that gaming feel (hunting mobs, doing missions).