Perfect State by Brandon Sanderson

In a world where individuals live in personalized virtual realities tailored to their deepest desires, the protagonist, Emperor Kairominas, rules his own fantasy realm with absolute power. However, his seemingly perfect existence is disrupted when he is summoned to meet with the Wode, the mysterious overseers of these realities, and tasked with a mission that challenges his understanding of identity and reality. As he navigates this new assignment, he encounters unexpected challenges and revelations, leading him to question the nature of his own existence and the true meaning of freedom and control.