Invincible Exchange

Invincible Exchange is a long serialized time-travel novel by the web novelist Kaixin Xiaoshuai, serialized on Qidian.com since 2012 and now completed. The story begins with an apparently ordinary "prize win": the young Li Yalin wins a big prize and thereby becomes the heir of a certain great deity, acquiring a power system built around "exchange." He can exchange for skills, bloodlines, classes, and items from games, create characters from anime and games to serve him, and freely choose to enter different anime dungeons; even more unexpectedly, he also retains the ability to grow stronger by leveling up and training. Thus an ordinary homebody protagonist begins to travel frequently among the real world, otherworldly continents, and various dungeon worlds: in the otherworld, he starts as a mercenary and is gradually drawn into kingdom conflicts and continental wars; in dungeons, he faces zombie crises, demon-subjugation battles, and more, deploying Diablo skills, Heroes of Might and Magic units, and summoned anime characters to fight in concert. As the plot advances, he keeps unlocking stronger equipment and permissions, integrating scattered combat power into a cross-dimensional team, and the story's scope expands from personal growth to battles on planetary and even cosmic scales. The work is briskly paced, its setting serving the thrill, while using the protagonist's choices to discuss the theme that "exchange is choice, growth is sovereignty": to be invincible is not to dominate all beings but to have the power to protect those one wishes to protect.