Turn in Frostmourne, and the Country Will Grant Me the Title of King of the North.

Ye Bai traveled to the Blue Star where monsters invaded, awakened the SSS-level supreme hidden talent, and took charge of the artifact [Frostmourne]! He can transform the monsters he kills into undead servants who are absolutely loyal. Ye Bai directly handed himself over to the country, and the country devoted all its resources to training him and helping him become stronger. Dominate more undead warriors. Top instructor, exclusive guard, highest authority, legion leader, king of the north. Ye Bai secretly enjoyed everything this country could offer. Since then, China has gained an undead army. While the Awakened Ones from other countries are struggling to survive on the battlefield, China's Scourge Legion has begun to counterattack. When the defense lines of other countries were torn open by monsters, China's flag began to be re-erected by great lichs, death knights, and cave lords on the fallen land. Later, people called Ye Bai the Lich King.