Young Mu Chen, born with exceptional talent, hails from the Mu Territory, one of the nine great domains of the Northern Spiritual Realm. His father is the lord of the Mu Territory, while his mother's identity remains mysterious. Forced to leave when Mu Chen was young, he vowed to find her. Chosen by the Mirror of Judgment for his innate gifts, he enters a competitive trial, where he rescues the troubled young girl Luo Li. A budding affection develops between them, and they promise to enter the Northern Heavens Spiritual Academy together. As the sole participant from the Northern Spiritual Realm, he is framed as the culprit behind the "Spiritual Path Blood Calamity" a year later due to a scheme and is expelled from the competition. Unyielding, Mu Chen encounters the Nine Netherbird by chance and obtains divine techniques. Through rigorous training, he participates in the academy's preliminary selection for the Mu Territory, breaks through to the Sovereign realm, wins the championship, and earns admission to the Northern Heavens Spiritual Academy. To save his mother, Mu Chen must grow stronger. Together with the Nine Netherbird, he ventures into the magnificent Great Thousand World in search of the Immortal Diagram to advance his abilities, arriving at the vast Daluo Territory. After enduring bloody storms, Mu Chen rescues his mother, eradicates the evil clan plaguing the world, and transforms from a grassroots youth into a great hero who shakes the continent, upholding justice and vanquishing evil, while also finding love and friendship. In the fourth season of *Battle Through the Heavens: The Great Ruler*, will Mu Chen be able to participate in the struggle for the Sacred Spirit Mountain? Can the grudge with the Dragon Demon Palace be resolved? What is his mother's true identity? All will be revealed in *Battle Through the Heavens: The Great Ruler* Season 4!