I Possessed a Demon Lord and Became the Destined Villain

[Villain + High Martial Arts + Invincible from the Start + Ruthless + Cunning + No Idiot Plotting + Myriad Worlds] Chen Nianjun was a nobody in the real world. After an accidental death, he is reborn from the real world into a cultivation world overflowing with Systems. From the start, he takes over the body of the world’s number one demon and becomes the master of the greatest Demon Palace in the land: the Hate-Heaven Demon Lord, feared by all the heroes of the world. He also gains twelve stunning demon consorts, known as the Twelve Demon Consorts of the Hate-Heaven Demon Palace, a headache for everyone in the land. Miraculously, from the moment he is born, he possesses an AI-powered omnipotent System with many heaven-defying functions: 1. Taking over bodies, 2. Destroying other people’s Systems, 3. Knowing everything, 4. Chatting and even hurling insults...