This is more of the D&Dish stuff I've been doing for fun. A while back I found a list of all the prestige classes in WotC books (there are around 700 of 'em) and used that as a way to generate ideas for what to draw.

Here are some of the resulting characters - a Thrall of Demogorgon, a Thrall of Malacanthet, and a Master of Shrouds. There's problems of course, but I kinda like it anyways.