Toaru Majutsu no Index - Volume 11, Chapter 4: Fireboats and a Battle of Gunfire. Lotte_di_Liberazione.

An underprivileged prodigy, a cruel, ruthless world, and an epic story of battle and conquest. A young man with an exceptional inheritance leaves the small, rural city from which he hails on a journey to find the girl of his dreams. He defeats countless prodigies, sweeps through all forces that dare to stand in his way, and progresses step by step toward the pinnacle of all the worlds!
“I’m not targeting any gods in particular. All I’m trying to say is that all gods are trash in my eyes!”

- Description from Novelupdates

After a shocking reincarnation, our hero opens her eyes to a new (and messy) world the last thing she remembers is reading Lady Viper’s Vow, a dark fantasy novel about a cruel, misunderstood villainess and her path of doom. But when our protagonist finds herself reborn right in the heart of an attack, she’s moments away from a second, way-too-soon death. Just as she’s about to face the end, a mysterious “system” pops up with a single mission: Level Up or Die Trying. It’s bossy, snarky, and her new best friend. As she levels up into a borderline-cheater powerhouse, she discovers her fate isn’t to be a hero, a princess, or even a sorceress, but to protect the one person no one ever expected her to side with: the villainess herself.

Xiao Yu transmigrates into a comprehensive xianxia universe, becoming the senior brother of Tianyong City and activating the Immortal Emperor System. Starting from the Foundation Establishment stage, he ascends through the Golden Core, Nascent Soul, and Spirit Transformation stages, ultimately achieving immortality! This universe seamlessly integrates multiple xianxia classics, such as Chinese Paladin 1, Chinese Paladin 3, and Gu Jian Qi Tan, among others.

“Dafeng Night Watchman” tells the story of modern policeman Xu Qian'an who traveled to the Dafeng Dynasty. As soon as Xu Qian'an traveled through time, he was involved in the case of the loss of his second uncle's tax silver. He was later implicated and imprisoned and faced exile, but he successfully solved the case with his past life experience and wisdom, rescued himself and his second uncle's family, and joined the night watchman organization. After that, he encountered various murders, political struggles, and entanglements with mysterious forces. He killed his superiors in anger to save the female relatives of the prisoners, was involved in the Sangpo case, participated in the struggle between Buddhism and the Kingdom of Ten Thousand Monsters, and entered the sight of major forces. In the end, Xu Qian'an realized that his mission was to plead for the people and protect the weak. He began to run around for the people of the world, promoted the alliance between Dafeng and the Southern Xinjiang Gu Clan and the Kingdom of Ten Thousand Monsters, and joined hands with Princess Huaiqing to launch a coup to save the people of the world. The novel combines a variety of cultural elements such as Confucianism, Taoism, Buddhism, the demon clan, and sorcerers, showing Xu Qian'an's intelligence and detective skills.