Brannick

I am guessing the book is predominantly about Lorgar 'Aurelian' (as he is named) post Isstvan.

Absolutely with Tulkas on this. Isn't Ehrlen the World Eater who faces down hundreds of his defected brothers along with Angron so that Tarvitz (isn't it?) can run for it? The scene where Saul looks back and Ehrlen is getting smashed down and they stare at each other is quite moving, well, I thought it was.

Argel Tal - now with wings! Ok, so don't go there........

James Swallow writes as we speak! (or so we are lead to believe)

The Knights of Taranis marching out from the Magma Forge at the end of Mechanicum - that was pretty darn epic and very movie-adaptive.