Well, in 'Overlord Vol 10 Light Novel', one key feature could be the deepening of the power dynamics. The main character's influence and power might grow or face new challenges. There could also be more exploration of the various factions within the story world, their relationships and rivalries. For example, how different races interact with the protagonist and each other can be a significant aspect. This volume might also bring new magical elements or strategies into play, adding more depth to the overall narrative.
Ainz is always an interesting character. His complex personality, being a powerful undead but still having some remnants of his human self, makes him stand out. In Vol 13, his decision - making processes and how he deals with new situations are fascinating to follow.
In Overlord Vol 13, one of the main plot points could be the further development of the relationships between the various characters in Nazarick. For example, Ainz's interactions with his subordinates might have new twists. Another point could be the exploration of new territories or the challenges faced while expanding the influence of Nazarick in the game - like world.
Some websites that might have the Overlord light novel for online reading are RoyalRoad and Wattpad. But be careful as not all of them might have the legal rights to host it.
You can start by getting a copy of the light novel. Then, set aside some quiet time and focus on the story. Take it chapter by chapter and enjoy the details.