OP world building in light novels usually involves unique forms of transportation. In 'A Certain Magical Index', the use of esper powers and magic for movement is an example. There are also distinct cultural elements. In 'Spice and Wolf', the trading culture and the different beliefs of the people in the world are important. The worlds often have an overarching threat or goal. In 'Guilty Crown', the virus and the struggle against it is what gives the world building a sense of purpose and direction.
In OP world building of light novels, there is often a hierarchical power structure. Take 'Naruto' - like light novels, there are different levels of ninja abilities and rankings. The world also has a backstory that shapes the present situation. For instance, in 'Attack on Titan', the history of the Titans and the walls is crucial for understanding the world. And unique ecosystems are created. In 'Magi: The Labyrinth of Magic', the different dungeons and the magic within them form unique ecosystems.
Chapter 300, "Relentless Pursuit, the Beast Tide Breaks the Wall", is the clearest early answer because it turns Bang's situation into a concrete plot event. The setup is Second Year of Great Xia, July 4th Bang..., but the pressure keeps building through On the west side of the main zone entrance of the Hive underground, a.... Once the chapter lands on He should have gone to inspect other places;
Chapter 73, "Does Someone Like Jiang Li Deserve to Have a Fan Club?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 345, "Luo Ming, Mirror Valley Defense Commander, Beast Tide, Great Xia's 6 Armies", is the clearest early answer because it turns Mirror Valley Defense's situation into a concrete plot event. The setup is Great Xia, Year Seven, September Ninth, the latter half of the night..., but the pressure keeps building through For those stationed outside the city and within the Great Xia....
Chapter 313, "Preparations for Migration, Population Surge, and Placement of Cold Resistance Level", is the clearest early answer because Long Mountain finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from From the moment Xia Chuan announced in front of hundreds of thousands... to Children under six receive five pounds per month." ..........
Chapter 315, "New Policies for Long Mountain, Cold Apple Tree and the Silver Mine (Part 3)", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with At present, even the Cloud Dragon Army that cannot appear during the... and follows through with Given that her ages with the eldest and second elder were over thirty....
Chapter 335, "Songyang Ridge, Seven Clans Submit, First Shipment of Silver Arrives", is the clearest early answer because it pushes Ji Yang into a new phase or setting. The setup is In the past, getting married to a lord was wholly different from..., but the pressure keeps building through He exchanged a glance with Nie Xinchuan, a hint of hesitation....
Chapter 95, "The Problem Lies with Your Boyfriend", is the clearest early answer because it turns Xu Ling's situation into a concrete plot event. The chapter turns that into something concrete by moving from Hearing others praise her daughter, Aunt Lin was smiling so wide she...
Chapter 281, "Yang Li's Repression and Resentment", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. It opens with 48th Year of Longyou, June 1st On the snowy night of Long Mountain,... and closes on In the team, a young man with an honest face spoke up, helping Yang.... The key payoff is that the chapter closes with "Yang Gan and Li Yuanqing sent you to join the team probably to monitor me and Brother Hu, not to ruin my Hunting Team.
Chapter 315, "The Strange Cold Apple Tree and the Seized Silver Mine (3)", is the clearest early answer because it turns Cold Beasts's situation into a concrete plot event. The chapter turns that into something concrete by moving from Thank you, Leader, for the Spirit Pill. to This is almost unquestionable; otherwise, where did so many Cold....
Chapter 343, "Five Cycles of Bone Tempering, 1,000 Zong Bone Burning in the Visible Yang Realm (Part 2)", is the clearest early answer because Xia Hong finally turns buildup into a real advancement. The chapter gives readers a real answer by opening on Next is the Small Ancestral Spirit Tablet, which not only adds a... and ending on But to his utter surprise, by this time it was already too late!.