Fantasy: Da Wa Was Sent to the World of Immortality at the Beginning

[Single female protagonist + no harem + male protagonist decisive in killing + villain not brainless + third person] In the lonely and dim starry sky, the long-broken brilliance of the ancient stars is still flowing. The true dragon with its body spanning thousands of miles stares at the infinity with its golden vertical eyes. There, an incredibly huge silver-gray ship is standing silently. The energy of hundreds of stars is condensed. Everything will perish under the power... This is no one's story. This is a protracted war that started in ancient times and reached one of countless pre-existing endings.