Zen, looks like you forgot to mark the Basecost for Naga and Golden Naga as changed in the readme, it's down to 90 from 100.
The Caelian Arch Seraph has also not been edited at all, so (other than flying + CR) it's currently far inferior to a lot of the other rainbow pretenders. Something sneezes too hard in its direction and it's toast.
If you (or anyone else) are interested in seeing it, I made some changes into the conceptReadme file (edited file attached). I edited out a couple of spelling mistakes and organized the changes on each pretender into a systematic order, the order of listing varied quite a bit.
I also organized the pretenders by type to the following categories:
Monster,
Giant,
Immobile,
Human (rainbow), and added an
Unedited Category where the pretenders with no changes are listed. Makes it a bit easier to find what you want if you're looking for a specific pretender's changes.
There are a few pretenders that didn't really fit squarely into any one of the categories, and they are: Virtue, PoD, Medusa (listed under monsters), and Ghost King, the 3 Lich types and Bog Mummy (listed under humans despite being death specific).
Now, I might be ignorant of the finer points of balance issues, especially where multislayer games are concerned, but as of right now, your mod is getting permanent enabling on my Dom2, it makes so many previously useless pretenders attractive and even makes some of them more thematic. Great job!
Edi