The primary goal is to unite China under a single ruler. Unlike some later entries that focus on individual officer life-sim elements, ROTK XI is a "ruler-focused" game where you manage every aspect of your kingdom's growth:
The Romance of the Three Kingdoms by Luo Guanzhong | Goodreads Romance of the Three Kingdoms XI with Power Up Kit
The Power Up Kit is an expansion that significantly deepens the base game with several critical features: The primary goal is to unite China under a single ruler