This is a neat article. I like learning more about Tharizdun, and I want to work him in as an adversary in one of my games.
The sharn also strike me as suggestive of the qlippoth from Kabalistic Judaism. Basically, qlippoth are the evil husks and detritus of a previous universe. Suppressed Transmission, a column by Ken Hite in Pyramid Online, mentioned them quite often.
