Think ascension or/and transforming into another race. Lots of ways it could be added too either enhance what is already here or to expand on leveling for upper tier players..Everyone starts as one of the basic races light or dark for example and upon reaching some stat level or record they are given an opportunity to become a different type of lifeform.
With different racial abilities or handicaps. Basically giving different plateaus for players to reach. It could come from a prize or a goal that is reached. Different cities could be added. Different maps underground or in the sky on various planes of existence. Maybe it resets everything or maybe it allows the player to choose racial modifications for themselves with the race of there own choosing. In certain parameters of course. Maybe its just fluff added content too personalize players accounts. Maybe it adds to the game in some fashion soon or later. Like an expansion or an added reason to the story of how or why dark and light are fighting. Or is just a feather to put into a players achievements. Perhaps something interesting enough to code right away or later down the road at leisure to add more dimension and color to the world.
Anyways thoughts?