The keys to the kingdom (continued)

I just finished the last book of the series and believe it can make a great roleplay, I am thinking of something were Arthur (architect) was still inexperienced when creating the dimensions again and as he has done that he has created a strange creature which combines some of the most magically powerful beings with Arthur's past enemies creating a smart and powerful creature that wants Arthur's work to be destroyed.

Thats as far as I have come and I am open to any suggestions.

Any one interested?

I haven't read Lord Sunday and I really want to. Sounds cool, I'm game but I'd need a little more detail of the something strange ya know?

Well for this all the evil house masters will have combined in soul. And in these books souls are cast into the nothing. And in this case the evil and the strength of these souls is strong enough to survive the nothing and create a new body. It would be a monster made of pure nothing, which gives it the ability to change forms.