A Villainous Daughter, but She Is Invincible for 30 Seconds

(Female article) The noble girl Cassandra was divorced by the prince and was exiled to the North. She learns that her destiny is to be the "villain daughter" in the otome game, and she is doomed to fail in the fight for love. However, she gained a special ability: every time she saves a person with medical skills, she can become invincible for 30 seconds. I think about the time when there was a guy who could conquer the world by stopping for seven seconds. What should I be afraid of if I only have thirty seconds? Men are just stepping stones on my way to dominate the world and compete in the Central Plains!