This book is an extremely demanding book and should only be written by highly advanced authors and authors with a lot of patience. This book focuses on the exploration of all little parts of the world and the description of nature and beauty, all the while conquering a parallel earth in a cold weapon era. The patience is needed to research on all different cultures and pieces of land on earth, so that it is possible to describe it artistically and take the readers on a heroic travel. Please expect this book to be long, slow but pleasant and relaxing with occasional battles.
The protagonist is reborn on a parallel Earth as the crown prince of the land we would call China. This, just like the Record of the Conqueror novel idea should focus on things such court intrigues. Even though the MC is reincarnated since birth, the plot should really start with a grand and brutal battle for the throne which describes the ruthlessness of the royal family, the elegance of intrigues and the beauty of life, nature and traditions. This book should slowly develop into the conquering of the planet with an extremely slow progress. As mentioned before, the focus is all on the traveling with artistic descriptions of nature and beauty to simulate a travel through ancient times, exploration of cultures, accumulation of knowledge and not to make it boring, battles, politics and adventures. This book should also accentuate the benevolence of ruling a country and the brutality of war (thus the title) and show the widespread suffering of the world (true description of nature). Maybe add a lot of poems and quotes to set an atmosphere for the book.
Regarding the romance part, I would recommend choosing a commoner girl that the MC met during his travels as the queen as well as initiating historically common concubine selections.
This is an advanced literature work and might not fit the tastes of this platform but don't worry, I will post some light-hearted and fun fan-fiction ideas as well ;D