kenobi65 said:With 666 planes of the Abyss to populate, in theory we still need several hundred more.
Not every plane has a rule, some planes are ruled by less then a Demon Lord and some Demon Lords rule more then one plane.
Easy to imagine there are a few open holes for future plot lines as well. I have also always had the opinion there are not 666 planes but rather infinite in number, which could also mean there are "enough" planes that the forces of chaos have created. After all it wouldn't be chaos if it was a stead fast number now would it?