The Apocrypha line of books from Games Workshop first launched with the anniversary of the Space Marine. That book was exellent and full of all the Beardy knowledge some of us grew up with and others had no idea about (like MKV being an actual ful Mark of Space Marine armour and not some cobbled toegther arrangement that Forge Wolrd are peddling these days! Yes, this really annops me).
The word Apocrypha means "biblical or related writings not forming part of the accepted canon of Scripture" which gives Games WOrkshop a place to put all their old material without it seriously distrubing the canan of thier current meta. It is interesting to see howeer that there is so much old material that they have gone back to, and yet more that has gone by the wayside.
Index Chaotica Apocrypha differs from the Space Marine Apocrypha in a few ways - it goes back and looks at the rules a lot more, it features less art than the Space Marine version and it's incredibly wordy. This is a book you read!
++ More After The Jump ++
This above page is infact a pretty good example of the book - it's very wordy. Pages of text with small pictures, pretty much straight out of the White Dwarf magzines of the time. Whole sections of issues like 120 and 121 have been lifted directly and reprinted - no reformatting, just slapped in which at times is a bit odd because there are rules that now don't exist, but I guess it is Apocrypha after all.
There's a smattering of John Blanche and a myriad of fantastic artists that don't get a mention. Personally I think an index with pages numbers for the artists would have been nice.
These colour splash pages from Realm of Darkness show Space Marine banners and shoulder pads, with icons that now no longer exist for Legionjs we know so well.
The very unfamiliar icon for the Iron Warriors (bottom left) the Alpha Legion (below centre) and the Thousand Sons (below right) are all very different to the symbols we associate with them today. This twisted knot look for the Alpha Legion even pre-dates the capital 'A' which has since been replaced by the hydra heads. The Iron Warriors one is very differnet - any guess what the rest of the armour must have looked like.
++ VERDICT ++
If you're really into demons and Chaos, then this will be an interesting read. If you're into Chaos Space Marines, then that is a second or even a third place priority in this book.