Cultivating Immortality by Contract: I Got Burned by an Interstellar Civilization

Lu Chen transmigrates to a cultivation world and establishes his Foundation in just three years, only to be informed by the System:

You have signed the Star Abyss Agreement and become a "consciousness battery." The day the countdown ends is the day you will be harvested.

Every cultivation technique is a data interface;

Every wisp of spiritual energy is supplied by the agreement;

Every ascension turns you into an eternal prisoner.

As a cryptographer, he decides to give the System a little taste of what a "bug" can do.

"Since you made me your beacon, then I'll write you... a self-destruct program."