Peacekeeping military doctor Ji Ran transmigrated to the Immortal Cultivation Realm's Black Wind Mine. Carrying her portable combat equipment space, she overthrew the human-sacrifice mine, established the Thunder Fire Workshop, refined thunder-fire muskets, and successively defeated the layer-upon-layer encirclements of the Chiyan Sect and Taiyi Gate. She uncovered the truth of how the immortal sects betrayed their alliance and destroyed the Divine Machine City ten thousand years ago, ultimately shattering the spiritual veins, establishing the Spirit Stone Convention, welcoming the return of the overseas expedition fleet, and ushering in a new pattern of mortal-immortal co-governance.