Empyrean Monarch/Immortal Emperor

Empyrean Monarchs or Immortal Emperors were cultivators who had reached the peak of cultivation in the Yidao Realm. They were all monarchs of some sort reigning over vast and infinite domains.

Cultivators at the previous realm of cultivation competed for heaven's wills, and those that managed to shoulder at least one, reached this realm. At this realm, empyreans went with titles rather than their actual names. Their titles would usually be selected by themselves, and it was considered disrespectful to call an emperor by their given name rather than their title. Immortal Emperors gained the ability to use imperial edicts on their home world, one edict per heaven's will.

Heaven's wills were objects of immense power. An empyrean monarch would take control of them and inscribe their own dao onto them. This would result in a heaven's will secret law being formed. A heaven's will secret law was the main technique of an immortal emperor. This technique was formed by the emperor and would have perfect compatibility with the emperor. It would also be infused with the heaven's will resulting in it being unblockable by anyone except for other emperors.

Immortal emperors were so powerful that just by an ordinary object being around an emperor for a long time, it would transform into an emperor's possession. An emperors possession was an extremely powerful object that could be used to fend off peak origin realm cultivators. They had their weakness in that they were only usable a finite amount of times and their strength depended on the length of time an emperor spent with them.

Emperor true treasures on the other hand were treasures specifically created by the emperors. They are believed to be the strongest treasures in existence and can barely be used by anyone that wasn't an emperor.