Hmm... I was just in the process of updating my "Beast Without" Harrowed/Xenotheurge dual-progression PrC, and it dawns on me that Dark Deal (a prerequisite for it) is no longer present. Do you intend to include something like that as a Feat this time?

I've just read the description of Beast and Soul feats, and those are pretty much awesome. I really love those ideas. I haven't really done much thinking about Aberrations, but I'll try to give it some more thought. Just have so much on my plate.