The Circle
The supposed rulers of Kasar. They have done a very good job of keeping any information about themselves hidden; not even their highest diplomats or military officers seem to be entrusted with this knowledge. We have no idea how many members the circle has, if they are all clerics of Zargos, mages, something else, or a combination of all of those.
Some claim the Collapse wasn't a total failure and that the Circle members are all immortal Magus that have been in power ever since. Others are sure they are the only ones who managed to crack the secret of lich-dom and are all undead. Many further stories abound, and we can be sure that many of them are misinformation spread by the Kasarians themselves.
See A short-ish history of the world from the Collapse till now and the Kasarian Conflict for more information.