Age of Wushu will soon be introducing a new game mechanic that pits you against... yourself. The Possessed Encounter is a triggered event that will teleport you to an instance where you'll fight against a random Manifestation of Evil, complete with mirror counterparts of your character and any players with you.
These encounters can be triggered by normal NPC battles, through collecting life skills, or even by an act of Jianghu (suicide). Each character can only activate a Possessed Encounter once per day, but you can join your friends in their trials twice.
The Possessed Encounters -- as well as more promised winter content -- are coming soon.