Quick Transmigration: The Demon Host Is Seriously Awesome

[No CP + powerhouse + quick transmigration + wish fulfillment] After being betrayed and defeated, Zang Xin was sealed in the Prison Demon Abyss for a thousand years. One day, a System claiming it could travel through time and space came knocking. It had intended to form a contract with Zang Xin, but instead Zang Xin captured it and turned it into her personal laborer. Still, their goals didn't conflict. Zang Xin wanted the freedom to cultivate, while the System wanted the wish points of its clients. And so their pleasant journey through time and space began…