The Technomage clone collective.
These guys may appear in book 9... havent decided yet.
Anyway, the guy on the throne is Natha ('first' in Gosric), he was created as part of the same experiment that produced Merlok and Jadine (but much, much earlier, as he's about 1000 years old) but where Mer and Jad were left un-altered, Natha is highly genetically modified.

In Natha's arms is Zed... he lost his memory and got seperated from the others...

but now he's being reintroduced...