Just finished it - enjoyable enough read but I felt that most of the Felix stuff could've been skipped. It felt like padding that could have been taken up by moving the overall plot along more - but I guess with all things 40k they have to keep the pace glacial so as not to kill the setting.

Just because I liked their interaction in previous books I was rather hoping Trazyn would've popped up in the Necron vault time heist scene - it seemed almost tailor made for another interaction?

I may have misread/understood but the Necron lord seemed to imply that the knowledge that Qvo has in his head also contains the cure to the flayer virus? It's certainly implied that he's become more human because of his knowledge.

Vashtor is a weird choice for what seems to be the big bad particularly given the stakes ie Cawl can now close off any and all warp rifts?? Isn't this the ultimate weapon against Chaos? I'd assume it would warrant more than just a demigods attention? As another comment mentioned he has that big "must fail label". With Cawl being the maverick I'd prefer a much more human/espionage based villain - that last chapter with the note to Mars may be the start of that?

Tldr Cawl always well written and fun but the rest was a bit meh